Just in case you didn’t see this coming, Rock Band 2 has been officially announced, and it builds upon its foundation as the first music game to introduce co-operative band gameplay, multiple instruments, and a robust online multiplayer experience. By the way, did we mention that all the existing (and future) downloadable content will be work, and be playable on Rock Band 2? Some details for the game include:

• Backwards compatibility with Rock Band downloadable music content. All previously purchased tracks will immediately load into your Rock Band 2 song list. No need to re-purchase or re-download.
• The biggest and most diverse soundtrack ever featuring some of rock’s most prolific acts, comprised entirely of master recordings.
• Major new and dynamic online modes that will connect the entire Rock Band community in more ways than ever before both locally and globally.
• More variety of instrument choices than ever before with new and improved drum and guitar peripherals, enhanced functionality and innovative new designs – all fully compatible with the original Rock Band instruments.
• And much more.

“As successful as the original Rock Band continues to be, we’ve now had the benefit of the last eight months to listen to our fans’ requests and to build upon that foundation,” said Alex Rigopulos, co-founder and CEO of Harmonix. “Rock Band 2 is a second-generation band game that will elevate the music game experience to the next level.”

Rock Band 2 will make its debut on Xbox 360â„¢ video game and entertainment system from Microsoft this September and have an exclusive launch window in North America. Rock Band 2 will be available for additional platforms later this year.

“We expect Rock Band 2 to continue to drive an amazing social music experience on Xbox 360, said David Hufford, senior director, Xbox Product Management for the Interactive Entertainment Business, Microsoft… “We look forward to supporting Rock Band 2 on Xbox 360 as gamers continue to download hundreds of new music tracks from Xbox LIVE so they and their friends can perform the rock music they love most.”

More details regarding features and music for Rock Band 2 will be revealed at the 2008 E3 Media & Business Summit. Rock Band, the first installment in the franchise, garnered more than 40 awards including Game Critics Award: Best of Show E3 2007.

In addition, Harmonix and MTV Games today announced that The Rock Band online music store recently surpassed 15 million paid downloads since the game’s launch in late November 2007. With more than 200 tracks available to date via download purchase (complete list of tracks at http://www.rockband.com/dlc), the massive Rock Band Music Store allows players to preview and purchase downloadable individual music tracks, packs and albums from the vast selection of offerings available as they build their own custom Rock Band library.

So, who is going to be running out to the store to get Rock Band 2 right when it comes out?