Got mine. Had to log onto my xbox live account before doing this thing to get a code. When I wasn't logged in it didn't give me a code even when I got 100%.
There's another free Kinect Party DLC called 'The Star Gazer' up now:
http://marketplace.xbox.com/en-US/Product/The-Star-Gazer/42292b13-c36a-46b2-945a-378d2255dfcf
The Xbox 360 offer wasn't a part of the black friday deals though.
There should be a deal on hitman absolution since they posted this question on their official facebook: http://www.facebook.com/questions/491505084230293/
Started rolling out on Monday:
http://majornelson.com/2012/10/15/new-xbox-360-dashboard-update-starts-rolling-out-today/
Sure the last beta isn't the same as the final release?