Speaking on their Facebook page, the company wrote:
Harmonix is developing Rock Band 3 for worldwide release this holiday season! The game, which will be published by MTV Games and distributed by Electronic Arts, will innovate and revolutionize the music genre once again, just as Harmonix did with the original Rock Band, Rock Band 2 and The Beatles: Rock Band. Stay tuned for more details!</blockquote>
We're going to say: stay very tuned to our GDC coverage over this week.