Slade Wilson; AKA Deathstroke, one of DC's deadliest assassins, will be a part of Injustice: Gods Among Us. This now brings the roster up to 13.
NetherRealm Studios recently released a trailer showing the supervillain in action and he brings with him a plethora of weapons to dispatch his targets with.
Injustice: Gods Among Us releases for the Xbox 360, PS3, PC and Wii U sometime in 2013.