But, but ... that wasn't even our question!! So, we'll take this to mean -- without it being said -- that Project 9 is code for The Beatles: Rock Band. This wouldn't be the only oddly labeled Rock Band title on the OFLC site, as Rock Band Unplugged is simply titled Rock Band PSP.
Harmonix has been hiring like crazy -- and there are most certainly secret projects going on -- but "Project 9" will likely be all set to let us jam with Sgt. Pepper's Lonely Hearts Club Band this autumn.