The UPCORE-G1 will connect to your smartphone via Bluetooth, and then control Power Function motors.
It has 3 proportional controllers and 5 non-proportional controllers that have standard PF connectors. It also has a 3 axis gyroscope which can feed back information to your smartphone. They give the great example of using this to detect when you have a collision. Just imagine - a rumble of your smartphone when you hit an object!
Currently works for iOS5 and Android 4.0 although I couldn't find a download.
Anyone got more information?