Harmonix has issued an official warning on the Rock Band bundles that are being sold before the street date. Those units are not full-real retail versions of the game. They are incomplete demos that are getting accidentally sold.
Read the full announcement and explanation in the official Harmonix community forums.
ouch buying demos for full price...i would be freaking pissed
but i prefer GH3 better! I beat the DEVIL on a 1 on 1 and kicked his a$$ last night