Got my copy in the mail (Xbox 360 from Best Buy Canada). Codes in the case. Crappy eco-case broke and my disc was loose/wobbly. Those things are the absolutely worst. Was able to redeem my code. Expansion packs on the store, but as others note, no DLC in the store.
Still struggling to get a feel for the calibration/timing, but hitting ~95% on most tracks so far (admittedly not very far it) so it's not the worst thing... just have to try and read which instrument may be picked for a given beat matching sequence which is tough on a first play.
Surprised at how quickly the difficulty ramps up relative to the demo -- I think there's going to be a lot more meat here than I (or the public at large) expected... kudos. Presentation is great. Framerate in some spots really dips (not during gameplay but it can make some of the realm interaction muddy) and load times are killer. I just installed it to hopefully help w/ the latter.
So far, I regret nothing, except that we never got Rocket Man in RB3.