From Game Life:
EA, MTV Will Announce New Harmonix Game Monday
Electronic Arts, MTV, and Harmonix will announce the Guitar Hero maker’s next game this Monday in an early-morning teleconference.
In an email to media late Friday night, representatives of the companies said that MTV and Harmonix will also unveil a “first of its kind” partnership with major record labels and music publishers; representatives of those labels will be on hand during the teleconference.
Electronic Arts announced at Game Developers’ Conference earlier this month that they would publish Harmonix’s next game, but did not give any more details at that time.
Place your bets. I’m guessing Gangsta’ Rap Hero for Wii.