[@Cat Sidhe]
No, we'll be using the same classes, but with some tweeks to the Warrior, and Rouge classes, Mages will mostly be the same. I'm still thinking it through but for Rouges I see them as the straight up gunslingers, think something more akin to the Smugglers of SWTOR, and as snipers as well if the player prefers. Warriors will become more like Soldiers, I think they'd be wielding repeaters, and shotguns, real heavy weapons. The Specializations will be tweeked as well, and I'll be choosing ones from the previous games with some tweeks. Oh, and let us not forget that the classic swords, shields, and what not are still in use on rare occasions, especially shields as they're made sturdy enough to be able to withstand most firearms. I can see a Warrior using a shield, and a pistol, or something in a riot-shield-like manner.