In the latest video, a making of video called Creating DISNEY INFINITY: Play Sets, Disney have finally outed the Toy Story Play Set for Disney Infinity.
A few brief glimpses including the themed title screen for Toy Story in Space and a shot of Buzz, Woody, Jessie, Rex, Hamm and one of those Aliens is all you really get but it's the first time that the franchise has seen confirmation beyond the figures (it'd be extremely silly if you were doubting that it would exist considering the history of the game). The Toy Story Play Set may not be available at launch as previous numbers given would exclude it but of course things can change, if it is a post launch Play Set it looks likely to be one of the first of those so the wait shouldn't be too excruciating.
They have also recently posted yet another brief glimpse at creating in the Toy Box if you are looking for all the new footage you can muster.
The Achievements for Disney Infinity were also recently revealed by Xbox 360 Achievements, from the looks of things you will definitely be able to get all of them with just the Starter Pack (although perhaps some may be easier with multiple extra Play Sets) but there are a few multiplayer achievements that will require online play - such as being at the top of a stack of four players, something you almost certainly cannot do just in local 2 player co-op.