It's a fighting game from the makers of Mortal Kombat that features DC superheroes. The demo is available for download and it's quite fun.
The characters confirmed to be in it so far are:
Batman
Superman
Wonderwoman
The Flash
Green Arrow
Green Lantern
Nightwing (Robin all grown up)
Catwoman
Aquaman
Cyborg (Teen Titans)
Raven (Teen Titans)
Hawkgirl
Shazam
Deathstroke (general villain, Slade Wilson in the 'Arrow' TV series)
Bane
The Joker
Lex Luthor
Harley Quinn (Batman Villain)
Killer Frost (some icy bitch, idfk who she is tbh)
Ares (Wonderwoman Villain)
Solomon Grundy (Batman Villain)
Sinestro (Green Lantern Villain)
Black Adam (Shazam Villain)
Doomsday (Superman Villain)
It's out of the end of the month, I'm quite looking forward to it.