Meet Root: an educational robot that moves on whiteboards and comes with a visual and text-based interface to teach your kids how to code. It has position and direction sensing, a color sensor, and ambient light sensors. You get 15 LEDs and a speaker. The expansion port lets you add additional hardware.
Root is iOS ready and can react to sensors on your iOS device. It controls a dry-erase marker and eraser to draw and remove markings on your whiteboard. More information is available here.