Russ's interview with the MMO Gamer (all the way back from E3, according to Trion's Stephen Reid) is a great read for anyone exciting about the game's "emergent world" possibilities, as Russ talks frankly on how the team can get into the game and hijack the monster AI to control them, or how they can even do little things like have merchants who have limited time sales.
Russ also talks about the game's class switching system and subclass system, where you can pair classes with your main class to emphasize or change their traits. If you want more of a fighting paladin than a healing paladin, for example, you could pair the paladin class with the fighter subclass.
If you want all of the gritty details though, head on over to the MMO Gamer and check out the full interview. As we said earlier, it's worth the read.