Heroclix is pretty cool, but the gameplay is still limited by its simplicity (the thing that makes it good by the way).
To maintain that Imperial Assault feel, I think, now that Knight Miniatures are no longer doing a Marvel miniature game, it opens up for FFG (who already play nicely with Disney), to pick it up. Roll out 3'x 3'maps of city streets and the like, a few tokens to represent moveable/breakable terrain like cars and such. I could see this type game of game take off.