Coca-Cola on 30 June 2008
It will be compatible with the first.
http://www.mtv.com/news/articles/1590126/20080630/index.jhtml?rsspartner=rssYahooNewscrawler
Too lazy to check - is this before GH4?
More info coming at E3.
Aside from confirming compatibility and the September release date for Xbox 360, Harmonix is holding details about the new game until the E3 gaming trade show in Los Angeles later this month.
Also,
http://www.startribune.com/entertainment/22708079.html
