A few weeks ago I picked up the Disney Infinity starter set (and a few extras) for the Wii U. I have to say this is a pretty impressive game. Essentially you get multiple games in one package. Each of the figures in the starter pack have their own game world plus you have access to the Toy Box world.
The concept of the system is pretty interesting. You can place up to two figures on the game pad (included in the starter set and connects to your system via USB) and the game world piece. In addition you can add up to two power up discs under your figure and if you are just going to play around in the Toy Box you can add a disc there instead of using the game world piece. This gives you the ability to expand the game easily by purchasing additional figures or game expansions.
I have played all three game worlds (Monsters U, The Incredibles and Pirates of the Caribbean) and so far I like the Pirates world the best. It is quite fun to sail a pirate ship around the sea and attack other ships. I did also pick up the Cars expansion but haven't played that one much. For me the most interesting thing about the game worlds is trying to track down all the Toy Box pieces. Some of them require certain characters to access (so you gotta buy 'em all!).
The Toy Box aspect to the game is very interesting. Essentially you get to use all of the items you have found in the games to build your own world. You can spawn bad guys to fight, build racetracks and all kinds of mini games. You are mostly limited by your imagination! I haven't had a lot of time to explore the Toy Box area yet but will do so and post my thoughts (and screenshots)!