So let's see what we have here /predictions for the season/.
Power mirage left unchanged, without a question still a difficult build to execute properly. There are some changes that made it a bit more viable - Spellbreaker should be more manageble, which was probably the toughest 1v1 in pvp. I'm a bit concerned about the crit immunity that they received, but that should not really change much.
Holosmith is definitely going to be a meta build now, which is going to be hella annoying with all the immunity elixirs, so that's bad news for us.
Thiefs were slightly nerfed but as a power mirage they weren't that tough anyway.
Condi mirage definitely got stronger, it is really going to be an uneven battle in 1v1 (given equal skill level)
Condi mirage got a lot of fixes especially on axe side. I have previously used axe + offhand sword instead of staff anyways, and it seems like an even more tempting option now. I found staff not particularly synchronizing well with Mirage anyway, and the ambush buff won't help that in PvP. Now that SB and Scourge are not as tough before, melee fights will probably be less dangerous, so I really think axe will be the way to go. Haven't tested it myself in pvp though, but torment (!) and confusion stacking seems insane right now (and it was even decent before the update).
So my prediction: Condi mirage Axe/SW + SW/Torch will be meta with decent success. Staff will be a viable alternative. Power mesmer will stay as a niche profession.
What are your thoughts?