I think a drivable Batmobile is a must, as the only vehicle in AC was a cameo by the Batwing. It would be cool to see this universe's versions of the lesser villains, such as Ventriloquist, Killer Moth, Firefly, Catman. And, imagine a boss fight against Man-Bat, in the style of the end sequence of "On Leather Wings."
Meanwhile - Nameloi, I agree to a large extent to your comments. I don't like it when Batman looks too techy. The more he does (The Dark Knight is especially guilty of this) the more obvious he's just a bloke in a suit. The more simple the costume, the more extraordinary his exploits appear to his enemies. By having material COVERING the armour, they'll be more amazed when he shrugs off bullets. Also (like the comics), the Powers That Be need to decide if his suit is black or dark blue.