The Rock Band 2 bundles will be released tomorrow for the 360 and PS3. Looks like $189.99 everywhere. At Best Buy, you get a free "Kick Drum Shade" with purchase of the bundle. No idea what that is, exactly. The disc-only RB2 will also be released tomorrow for the PS3, at the typical price of $59.99. Not sure if there are any freebies anywhere for that one.
Looks like the Wii and PS2 versions of Rock Band 2 will be hitting retail exactly a month from today.
And, a week from tomorrow, Guitar Hero: World Tour will be released across most of the major platforms. Similar pricing, I think: $60/game only, $100 game/guitar, $190/guitar-drums-mic, at least for the 360 and PS3 versions. The Wii and PS2 versions may be a little cheaper.