I'm going out on a limb here by assuming that this is going to be nothing more than a City of Heroes clone with a new graphics engine and the implementation of DC characters that will aid you in missions throughout the environment BUT my one big question is ......
Will there be a penalty for dying?
I don't know about you guys but the thing that ruined my MMO experience after the Diablo II years is how World Of Warcraft didn't have an experience penalty for deaths in the game.
In my opinion there was no skill involved in playing a game like that. No reward and punishment system built in. You just played, played, and played and you'd find something sooner or later and there was no consequences for your actions.
This is definitely a make or break feature I hope they add to the game because if they don't its not going to have the challenge I prefer.