It's been rumoured before, but following comments from a Sony Music Publishing executive it looks as if there's a genuine possibility that Activision and Sony may come together to produce a Beatles tinged version of Guitar Hero.
Speaking to the Los Angeles Times, Martin N. Bandier of Sony/ATV – the company who owns the copyrights to the Beatles back catalogue – admitted that, "It's something we have talked about and would like to pursue." Previously the use and distribution of Beatles songs has been famously guarded, with no presence online on iTunes or other download services, but this has recently relaxed suggesting that a Guitar Hero Beatles Pack is a very real possibility.
Activision has already announced an Aerosmith themed Guitar Hero, to be released this coming June.