Infinite Crisis is set within the DC Comics Multiverse and features a large and quickly growing roster of both familiar and new Multiverse variations of your favorite heroes and villains as well as a variety of maps, each offering a different gaming experience.
Now it's an open beta and free to play. No invite needed. Just go here.
To go with it DC is doing an event on their website where they will be doing interviews with the game deveolpers, a MOBA 101 guide for beginners, a look at the upcoming comic book and action figures, etc.