From the looks of the game, it doesn't seem like the mesmer class will be returning. Since there are only three "scholar" professions, it doesn't seem likely that the mesmer will make the cut. How sad.....
The lower left corner has most of a character cut off, however we see them casting a skill with whitish-blue effects and a whitish-blue ankh (the profession indicator icon for Monks in GW1) floating by their hand as they cast. It's true that this is just conjecture, but it does give possible credence to their return.
Personally I wouldn't be surprised if Necros were cut. For me, a main characteristic of the Necromancer class is summoning. However, I don't see why they would keep a class that can create tons of minions but abolish henchmen and the once planned companion system Other themes of the class such as hexes and degen could still be covered by Mesmers anyway.
From: PoisonArc | #006 I think the engineer will replace the necro.
Nice job copying my idea.
Ultimately, necros have the best lore-related reason not to return, as well as the fact that everything it does can be incorporated easily into something else. shutdowns into mesmers, minions into engineers, emoness into practically anything, etc.
Mesmers are there for sure. Necros have to be there, only like under 20% of necros play MM, and all other MM duties are slapped onto the heroes. The necro's main point is life stealing and SSes. Manipulation of conditions and the enemy's ability to do anything. Same with mesmers.
What if there was a joint mesmer/necro hex profession, maybe called Manipulator or Controller, that could degen(manipulate) the enemy and then summon and control minions, throw out curses and hexes etc.
Gameplay-wise that makes sense Gobber, but lore wise it won't happen. Gwen is too central to suddenly go down in history as someone who raises the dead.
Can you imagine a Gwen's mum zombie-lich?
It's just not happening.
There will be mesmers. There won't be monks. Necros will likely be in because of the orr storyline and their summoning mechanic. But I bet it will be altered to be more like WoW's warlock class. With a non-instanced world, too many mms would equal too much server disruption and havoc. There will be a very low limit to the number of summons you can have. Like 3-ish small ones or 1 large beastly one. That's my prediction.