We don't know exactly what the online multiplayer feature offers, but if it's more than just a leaderboard, we'd be pumped. Sure, lag would seem to be a problem unless the whole song is pre-loaded before the multiplayer gets underway or something (thank you, PS3 hard drive?), but it could just be a score comparison between two players. This is sort of a test run for the inevitable multiplayer bound for the gigantic ambition known as Rock Band. What do you think this multiplayer will consist of?