In case you're too stunned to comprehend what should've been no-brainer functionality from the start, your PS3 Rock Band 2 drum set should now be guaranteed to work with GH:WT and RR, and likewise for every game's guitar and drum peripherals. Said Shorrock, "We're still working hard to ensure compatibility between the Guitar Hero and Rock Band titles currently on the market, and we hope to have an announcement on that shortly."
We're excited, but at the same time, we're a bit dismayed it took this long to sort out. To be clear, instrument compatibility has not been confirmed for Xbox 360 (although we do know GH:WT instruments work with RB2) or Wii versions of the music games. Microsoft, Nintendo, we're looking to you to make this universal compatibility, erm, more universal.