Alan Tsang of PS3Fanboy says,
"We mentioned before that Rock Band 2 will allow players to "export most of the Rock Band disc tracks and upgrade them into Rock Band 2 gameplay." Most means not all. So what tracks are excluded? Joystiq got a chance to talk to senior designer Dan Teasdale, who said the final list of importable songs is still up in the air, due to licensing issues. Apparently Harmonix had to re-license all of the tracks from the first Rock Band. Sources are saying the number of songs excluded will probably be around 2 to 3. This is speculated to be caused by the new exclusivity deals with Guitar Hero: World Tour.
The official Rock Band 2 website has also been opened. No new information, but there are a couple of IM icons and wallpaper. The website also allows you to pre-order the game on the Xbox 360 on Amazon, but a quick look around also leads a pre-order for the PS3 version, including the Special Edition which includes the instruments. We did notice the Special Edition is has a release date listed as October 19th while the game by itself has it listed as November 30th, but these dates are probably inaccurate. The 360 Special Edition, which already has a confirmed release date of September, also has the release date listed as October here."