I was just thinking a Flash game might be cool, kudos to anyone else who said so. It would be nice to get a good superman game as there is potential there but... and maybe this is a side effect of reading Seven Soldiers recently, but couldn't we have a game with multiple comic characters who each play very differently and a subtly woven plot. Okay, I'll come out and say it, SEVEN SOLDIERS PLEASE!!! You could satisfy everyone: Crazy trippy magic sequences with Zatanna, strange adventures from a unique perspective with Klarion, epic action scenes with Frankenstein and The Guardian, comic misadventures with Bulleteer, the bizarre confusion and deeply trying adventure of The Shining Knight, and last but not least we can have some kind of crazy escape based game mechanic for Mister Miracle. All converging on the biggest crisis that the big guys all missed out on! Think of the potential!!!
Edit: To expand on my statement about the potential of a superman game as not a lot of people are seeing how one could threaten superman. That's simple, what's the one comic premise (aside from kryptonite, which is just cheap) that has always threatened superman?: Time. He's always racing against time to save everyone (and no, he can't rewind time, that was absurd), so you need to make a game that is about speed, moving fast enough to save lois, the full tram that's about to fall onto a crowded city street, while fighting a massive robot and stopping bits of debris from hurting nearby children watching in awe, all with plenty of time to stop Lex Luthor's escape attempt and expose his plan to bring the world banks under his control.
So, yeah, A Supes game shouldn't be about fighting (though it totally shouldn't ignore it and there will have to be some epic bosses), it should be about speed and heroics.