With the teaser of Arkham Asylum 2 shown on GT and the VGA's, here's what i want from the next installation:
1. More Gadgets, batman has alot has disposal and add in a few more unique and fun gadgets and tools.
2. More batman villains, in the first game you only fought Harley, Ivy, Croc, Scarecrow, Bane, and Joker. Everyone else was more or less of a cameo or a fan service shot...add more villains and I will be a happy camper.
3. introduce Nightwing, adding him would be a great addition to not only the combat but it gives us a potential for co-op.
4. alternate costumes, pretty simple with this, after completing or find during game.
5. Hero cameos, you could make some mentions of the league. To show its more than just the batman universe.
Hope they add these in and make another spectacular game, the first one they made it great now its time to up the ante.