i think it's safe to say that if OBTS doesn't show up as DLC in the next month or so, it's probably a Blitz song. i doubt they'd have a song ready and available on their xbox more than a month ahead of release.
I am stoked that the RB Blitz songs will be playable on RB3. Now I can choose not to download "Jessie's Girl" for Guitar Hero!
Harmonix has a history of "leaking" things via song lists visible in the background of their videos.
I think sometimes it's even accidental.
There are some movie promos that have songs advertising them that are never in the movie, it's not unheard of.
Is RBB goin to be avaiable for download at the PlayStation Store or Xbox live???