With each new expansion Arena net has expanded on the lore for what the professions provided and how they worked. For HoT there wasn't much lore beyond some loose connections with Herald to Rytlock and Druid since we were going into the Maguuma Jungle. The justification was minimal, but that was honestly okay since this was there first expansion and they where getting their feet wet. With PoF each elite spec had some more lore justification for what it is. Its themed to the desert with Scourge, Firebrand, spellbreaker having the strongest connections to the story of the region and even the weakest lore connection elite spec, renegade, still was rich with lore of some kind.
So what I would like to do is look at the lore of Cantha and surmise what we can get from it. Cantha is rich with history and has been very isolated from the rest of tyria for a long time. And last we heard there was the rise of Emperor Usoku exiling non human races from Cantha. The Ministry of Purity which was formed in GW1 from the fall out of the epidemic that plagued Cantha during the return of Shiro Tagachi. There goals are fairly clear in favor of aiding the people of Cantha, but in the early years they had schisms in the factions with Nationalistic ideas which had been spearheaded by Minister Reiko Murakami a powerful mesmer at the time. This point in history goes to show us just how much the future was impacted by plague and how much it left a scare on their nation. If we're going back to Cantha, it'll be very likely the Emperor, whomever that may be, and the Ministry of Purity will be the enemies we will be facing.
With this in mind we can begin to piece together at least one and possibly two Elite specs we might see, or at least there themes. The Mesmer from what I can see will have magics that relate to the Ministry since the founder was a prolific Mesmer and She would likely be hailed as a hero in the story while the GW1 heroes would more likely have been forgotten or slandered for her death. Her magics in the fight mostly involved her clones, the precursor to GW2, but she was also able to manipulate conditions as well as being extremely disruptive with her attacks. What this will translate to is a bit hard to say given her skills in game. Possibly better clone control but we'll have to see. I'd like to see what everyone else comes up with in this regard. But I defiantly believe that mesmer will be tied to the Ministry.
I also believe that the Guardian will be tied to the Ministry as a "Purifier" sounds right up their ally. What more it could do is difficult to say as we already have a burning elite spec, but an Anti condition type elite spec might be something we can look forward to.
Going further into the lore we have the Assassin which is unrelated to the Ministry, or at least apparently so. This is long requested of the Thief players and there is a strong lore president for it in game, but its not something I'm personally too convinced by.
The second profession of the lore was the Ritualist and honestly there are some serious conflicts it has with the necromancer. In the early game of GW1 the Ritualist would find the necromancer to be a nuisance as they seemed to find them to be unclean as they would reanimate corpses as opposed to their own form of death rituals. This could be a major point in the lore as Purity and Nationalism might either force necromancy underground or force them to conform with the Ritualist's means of summoning. Its hard to say, but this conflict is something to take note of and can be speculated on.
Elementalist is next on my list. One of the rites during the Factions which was needed to see the spirits was the Mission "Closer to the stars". A ritual in which the players must defeat the celestial bodies to achieve Cantha's version of Ascension. There were four of them each with a tragic tale. And my suspect is the elementalist will attune to them, although this might be a loose connection as they're celestial creatures, not elemental creatures, I could see it as a means to give the elementalsit that 5th element we all have been salivating for for so long. I'll admit this is a very loose connection.
Engineer has really nothing to go on unfortunately. The best we can possibly go with is ideas from real world history and real myths. Such as the real world history that the Chinese were the first recorded nation to use gunpowder. And the Chinese fireworks are quite famous. Beyond this the Super sentai warriors of Japanese pop culture could be a means of inspiration. Its super flimsy I know, but Engineer is all about looking forward and an isolationist and Nationalistic nation like Cantha just wouldn't be a nation that would look forward.
Although both the Kurzicks and the Luxons have been absorbed into the Canthan Empire and likely much of their culture was either absorbed or lost I still feel some could have survived. This is where I see the likelihood of the Ranger to get its elite spec from. Kurzicks had some odd magics with Juggernauts which i could see the ranger latching onto. Although If the Kurzicks and Luxons do still exist I strongly suspect that they'll likely be gangs in which the Ministry will be trying to quell.
Warrior is kinda a big question mark for me as I don't see them as much more than the bulk of the Canthan standing military force so its not something I would be able to really say what they could or would be like. Sorry warrior players.
Last we have the Revenant. Unfortunately for the revenant there is no possible way for their mist magic practices to get to cantha without some rift shenanagans going on.If we are to see any Revenants in Cantha, they'll likely be foreigners to the land and seeking new magics, or possibly uncovering history of the past. Many have suggested Togo as a possible legend, but I'm not so convinced. In terms of Canthan history his history might be mixed or even destroyed as he aided a treaty with the Tengu which would have state propaganda hatred for so he might very well be demonized. While Emperor Usoku would be an extremely strong candidate as a potential legend. or perhaps a Tengu hero we haven't seen. The revenant is likely to be somewhat Ronin inspired given their class characteristics of being a brooding shonen protagonist.
So lets discuss lore! Where could be go, what could be the inspiration. Lets have fun with this!