"Multiple new IPs" in the works at Rock Band dev, studio confirms.
Viacom is suing Rockband developer Harmonix for $131m, claiming a miscalculation was made during its 2006 acquisition of the studio.
New authoring standards means they won't be backwards compatible.
DLC includes Bad Romance, Just Dance, Poker Face and the South Park version of Poker Face.
Believes it was a mistake not working with the original Guitar Hero developer.