The game was at wizard world but was not for public consumption. You could only view a demo of someone actually playing the game and showing you how Jackie uses his darkness powers and the darklings.
I did ask him about multiplayer and he said they are working on a co-op concept where other people would be in control of the darklings.
It looks really great and the main reason it is not on the floor is because it is a mature title. There was a lot of swearing in the floor demo.
Graphics look great and gameplay looks to be next-gen, should be out early next year.