While it may not be the character they are talking about, I'm suspecting there will be a ranged character that uses guns/cannons (Act V NPCs hint at Larzuk wanting to create weapons in that vein).

I'm almost positive the Assassin, which is my favorite class, will not be making it back. I just like the speed and having to choose the appropriate charges to be effective. It made playing the game a bit more involved I found, so if there is a similar class, I'll more than likely be happy.