Brian Chan, senior designer of Rock Band 3, is apparently working as a lead designer on an “unannounced title (XBLA/PSN/Facebook)” according to his resume.
That’s pretty much all we know for now, however, we wouldn’t be surprised if we were to hear about this title sooner rather than later. Harmonix has been hard at work on something since Rock Band 3, so we’d go as far as guess that we’ll probably hear something about this new “unannounced title” by this summer (E3?).
We’ll keep you posted on this new development as it… develops.
Source: bchan.org