Hopefully they'll play out Josh Hartnett's character ("The Man") even more. That dude was cold as hell. And of course Marv (and lock in Mickey Rourke for it).
A Dame to Kill For should have been in the first one IMHO, just to keep the continuity. It was still fantastic don't get me wrong! It would have made The Big Fat Kill make more sense to people who hadn't read the comic. At least it's an excuse to bring Marv back for part 2.