This sounds a lot more like a commercial than I would normally share here, but the concept is unique; using a small spherical robot as a real time marker for your 3D Augmented Reality character to manifest on. This gives you flexibility and mobility not previously available to interact with your environment. While the usage they are targeting is within a game, the potential applications range far beyond that.
For instance, this could be used as a personal tour guide in a museum, slaved to a GPS, a museum map, and an extensive database of facts on each exhibit, along with speech recognition processing. It would be able to answer your every question about any exhibit in great detail. Or linked to the camera and a library of geometry and trigonometry functions, you could use nearby buildings and moving vehicles to learn various math functions with literally real world examples, and again query the system to get a full understanding of what you were learning, with your virtual tutor traveling your city or town with you.
OK, for the outdoor applications you might want to carry a pocketful of the round robots with you, to replace the ones crushed under city bus tires or swept into storm drains by sudden showers as you go along. But those bots are extremely simple, and after another 6 months of producing them ought to become quite cheep as well, making their use in such environments quite cost effective. Thanks to Tech Crunch for the heads up on this one.