Rock band 2's already out on 360 and PS3, but the other versions - Wii and PS2 - are running a little behind schedule. So far, in fact, that they're still not out yet. But they're coming! Or, at least, the Wii version is. A very public, very humble announcement on Harmonix's site says that Rock Band 2 on the Wii will be shipping on December 18, meaning that, if you're lucky, it'll arrive in stores just before Christmas.