IncGamers report, following their interview with Bill Roper, that the climactic Nemesis battles in Champions Online are going to play out like PvP fights.
"They don't do things like a lot of AIs you see that are on timers or other shticks, but they actually use powers, use cooldown, and react just like a player does in terms of how they use their powers and what you're doing," according to Roper.