Here’s an idea I have. You must be aware of the new Arduino 101 board. The board recognises gestures, and features a six-axis accelerometer and gyroscope. Control your projects with your phone over Bluetooth Low Energy connectivity!
This is awesome for varies purposes but most helpful for robots which requires position feedback. And when we talk about robots, we also need some sort of driver circuitry for actuators which is something that’s missing in this. I normally build my custom Arduino boards for robotic purposes. With a board having driver capabilities, it would be an awesome choice for robots. Adding Temperature sensor would also be good.