Rock Band 2 has received an official release date for the PlayStation 3 platform. While many gamers are still upset about the timed exclusivity that the title will receive on the XBOX 360, they can be rest assured that they will not have to wait long.
With Rock Band 2 releasing on September 14 for the 360, Sony fans will be waiting roughly a month for their chance to start rocking away once more. The PlayStation 3 version is set to release on October 19, which is coincidentally one month before the release of the Nintendo Wii version.
http://www.psu.com/Rock-Band-2-dated-for-PlayStation-3-News--a0004434-p0.php
Jippi good think that it has been dated.