MS: Xbox 360 instruments from Rock Band 2, GH: World Tour and Rock Revolution will be cross-compatible
Clarifying its stance on rhythm game compatibility issues, Microsoft's Gamerscore Blog announced today that all the instruments for Rock Band 2, Guitar Hero: World Tour and Rock Revolution will be "cross-compatible" on Xbox 360.
Sony announced yesterday that PlayStation 3 would feature full cross-compatibility among the three games as well. Guess that leaves only Nintendo to make it official.
Update: The Instrument Compatibility Matrix has been updated
[Thanks, Mike]