Meet meeperBOT: a power platform for your LEGO blocks, allowing you to build app-enabled machines. It is compatible with iOS and Android devices. The meeperBOT can follow behind you. You can connect multiple bots to your smartphone. The developers are planning to provide 3D designs of adapters and vehicles, so you can 3D print them yourself.
Yet another fun kit for young makers. More information is available here.