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Seeing as we know very little about the game, I think the best thing we can do is speculate! What sort of classes would you like to see in this game? Would you want something similar to a class in DAoC? Or perhaps something completely original?
As for me, I can't imagine a game like this without at least one "thief" class. It's the guy that doesn't charge into battle head-on, but hides in the shadows waiting for the perfect time to strike, only to crawl back into the darkness before his foes can react. His role would be to move around the crowds and attack key targets. Whether it's an enemy that's low on health running away to get himself healed, or if it's the healers themselves that were too careless to position themselves properly. He could climb a keep's walls and wreak havok from the inside, while his allies wreak havok on the outside, forcing the enemy forces to split up. He would excell at single target combat against unprepared targets, but would have trouble against larger groups of foes. Precision elimination with a cloak and dagger playstyle.