I personally wish that ArenaNet will leave the level cap at a firm 80. Any additional content that is to be provided can be styled for a level 80 cap, as opposed to a higher one. While I have a small, lingering idea that level 100 would be awesome, it really makes no difference. Rather, it would undo the air of finality that pervades a level 80 character. If ArenaNet wishes to add another axis of progression, I strongly advocate a process such as Ascension, in Guild Wars Prophecies (and the other two, though it felt less meaningful). In fact, I would be willing to accept another Ascension, but for a Guild Wars 2 character.