Mike Sean Baptiste (hmxsean), one of the developers from Harmonix, announced on the Rock Band (Xbox 360, PlayStation 3, Wii) official forums that the previously announced "Still Alive" DLC will be available tomorrow (April 1) on the Xbox Live Marketplace for free.
PlayStation 3 owners who want to get this will have to wait a bit. Sony's been doing some work on the PlayStation Network (revamp, anyone?) and won't be getting new material any time soon. However, Baptiste did mention that the "Still Alive" track will be available for free when the service goes live once again.
So it looks like Rock Band fans will be getting a nice little update soon. Be sure to keep checking back here for more news.
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Buy: [Rock Band Special Edition (PS3)]
Via Rock Band