Wal Mart will have an exclusive Bonus Disc. IIRC, it's a documentary on R2 and C3P0.
Not quite, but you're very, very close.
It looks to be something hosted by the droids, which tells the story of Anakin and Luke. This may have been something which aired on Fox around the time that Clones came out in theatres.
And word has it (although this may just be wishful thinking) that Best Buy's giveaway will be a Prequel Trilogy slipcase, to match the Original Trilogy slipcase. That would be similar to what they did with Kill Bill, Volume 2 last year.
We'll know for sure in about a week's time. . .