Boba Fett Missions Leaderboard: We aren't entirely sure what this is. But, it sounds like it's a side game, sort of like the "Road Hogs" time trials in Bad Piggies. Have another thought? Let us know!
Block Buster Achievement: Again, this goes along with the Boba Fett Missions. We're very interested to see what this truly means.
The release date for this update is unknown.
(* What is Game Center Sandbox? We looked it up. EHow.com has the clearest explanation.)