Kinda on the back foot in discussion at the moment it seems but I'd like to talk about this as speculation and seeing what others desire is a fun topic. I'd like to discuss what people would like to see. If its based on What theme you want to see or what you want mechanically, discuss both. I'm going to list some general ideas of what I'd like to see for each of the classes.
For warrior what I'd like to see is something I personally wouldn't like to play but I know people would enjoy. I'd like to see a tank elite spec. Something to really push them as one of the classes to pull and hold aggro. I preface this with that I feel GW2's aggro system should be changed from a focus on toughness to a more threat generation system in which all skills either generate threat or decrease threat so that a tank has to dedicate themselves to building threat which I feel warrior would be right at home with. Which could be fun to have warrior have a adrenaline skill that generates a lot of threat and causes taunt. However, if the system was changed, I could see Spellbreaker filling a tank role very well and I'd be pretty happy to have that on my team.
Another option I'd like to see is perhaps a war mage type spec which converts adrenaline into spell like abilities the warrior can use to strike foes with bursts of damage. Maybe that's a bit out there, but i almost never play warrior so I'll just say I'd much prefer to hear what warrior mains or off mains want as opposed to me who honestly probably wouldn't touch the class.
Guardian its going to be much the same as warrior. I'd like to see them also get a tank elite spec. I'd prefer them to be a bit worse at holding aggro but offer a little bit of support, no more than normal guardian but letting them mix a little without the heavy support tanking we've had in the past. So something more akin to a paladin or cleric you'd see in DnD. Giving them some form of cover abilities to aid allies along with their normal cover abilities.
Revenant I'd honestly like to see a high Melee power DPS spec. Something that serves Melee combat really well, so giving them something like a greatsword and channel, say, a Norn or tengu legend could be quite good. It could be interesting if they got some form of ability to swap your weapon skills based on your attuned legend as well as your utility skills by using your F2 ability, but that might be a bit complex. But that could be unique as you gain a whole host of abilities. I really like Revenant and it would be nice to see their Melee prowess served much better by its elite spec than it has been in the past.
A lot of people will probably disagree with me on this, but I would really like to see a Pack leader elite spec where you have a small pack of Pets of the same species to fight your foes for you. A heavy ranged focus elite spec that can't swap pets, but rather gains command skills or something like that that allows you to act as a sort of Control/support spec. It would be an interesting change of pace for them that could allow for some unique shenanigans. There is the issue with pet swapping, so i'm not too sure. I'd go for scepter+focus combo for this spec.
I like Ranger, I don't get to play them much since I like Druid and our guild is filled with druid so I often have to play DPS which I don't have proper gear for and its doesn't have my play style. But I'm sure some ranger players have some way better ideas than me.
Thief has a lot of DPS as it is. So yet another DPS spec might be a bit more of the same. This isn't a problem per say, a DPS condi spec that focuses on poison could be really cool and I'd be on board with that as I'm sure some thieves would be. One sort of spec I would like to see for thief is a sort of Shadow mage support spec that specializes in unique shadow magic that allows allies to flank enemies and offers them the ability to teleport enemies. There isn't a reason that a condi spec and a shadow mage spec couldn't be the same spec, but it was an idea I would like to see. For weapons I would like to once again see scepter/focus. Thief has had the unfortunate habit with their elite specs giving them weapons which don't give them dual skills. Thief getting a tone more dual skills would be really nice in my opinion.
I'll address the spec a lot of players want, which is the assassin. And you know what? Fair! Having an off hand sword with main hand sword sounds cool enough. The big issue I see with it is that it doesn't really add much to thief or change anything as Thief is almost completely superior to GW1 Assassin. Well, except for the Shadow form tank assassin, but I don't think that's really what people would desire. Unless you would? IDK, let me know.
Engineer, my second love, I have a lot I'd like to see with Engineer. But I do feel that Engineer absolutely needs to have a ranged spec. Both Scrapper and holosmith are both melee specs with holoforge being a melee weapon swap ability. It would be nice to see a Elite spec that Focuses on Minions... Yeah I know people don't like AI stuff, but boy do I love the idea of having my Golemmancer with a staff that shoots lasers. Send in minions which could have more versatility than necro minions due to the Toolbelt skills. Alternatively I wouldn't be opposed to having an elite spec that completely changes how the toolbelt works. But I digress.
A chemist spec could be interesting as well but I'd prefer elixirs be reworked into something more interesting and useful before this. But Chemical arrows could be fun with a longbow or short bow.
With elementalist we have the Overcharge sorta support spec, the fusing elements spec, and the one I'd like to see is the specialist type spec. I'd like to see an elite spec which removes Elementalist from being able to swap attunments but rather the F1-4 skills become Elemental spell type abilities which can enhance whatever element you're currently locked into. You'd still get the attunment swap and for traits if you're, say, locked into fire skills and you use the Air skill for the air traits it'll be as though you are in air but the reduced cooldown on the skills wont occur. But I wouldn't take swapping away without giving something else in return. I'd also like to see this sort of spec gain weapon swap.
I'm a simple girl at times. Sometimes I just want to throw a fireball. I've also heard people talk about the desire of having a 5th element. Which I would be down for for sure.
For the necromancer, this is probably the one I have the most to say about since she is my main. I wont say too much though since there's just WAY WAY too much I actually want and none of it I want on a single spec. So to put it in perspective, I'd like a proper healer spec, so like a shaman with Spirits. I'd love to gain a Sort of spectral shroud which gives me access to primarily supportive abilities that allows me to properly heal people as opposed to the barrier priest the scourge is. It wouldn't replace the scourge but offer a different role. i've made some older posts about that but we'll move on. Another spec I'd love to see is the Minion Master elite spec where they replace their shroud with conjuring a decent number of minions through skill 1 and use the other 4 skills as a means to command them into battle. Having a shield with that spec would be nice, but I'm warming up to the idea of a hammer. Lastly there is the Highly self damaging Blood thirsty Vampire spec that I'd like to see that sacrifices large chunks of their own health to modify their DPS giving necromancer a proper DPS spec that is both high risk and high reward.
Mesmer is one of those classes I want to love, but I struggle to enjoy it as much as I did in GW1. This issue I have is more because of its similarities to Assassin and Thief because I feel its a bit more Melee and tricksy than controlling and tricksy. So My personal preference for a Mesmer elite spec would be to push an Elite spec that is far more in line with the Guild Wars 1 builds the mesmer was famous for. I've made Posts about a Siren elite spec which is a DPS and control spec which could change the shatters into Ground Target AoE short lasting Hex like effects. Or even converting the Phantasms into these AoE hex like abilities. I like the idea of having the ability to create these Hex like abilities as well as just having a Field control type spec that really embodies the idea of Mass Hysteria. Covering a point for a short duration with an AoE hex like ability could be really fun. Punishing foes for daring to look funny at you.
These are sorta the things I'd like to see. What about you? What would you like to see?