There were some interesting new MIDI products introduced at SXSW. One of them was the wireless BTLE MIDI controller for DMET Product Corporation.
It can control sound, DJ Video software, and lights. Of course, it is all done by mapping MIDI signals and in some cases translating them to different protocols.
Here is a video of the Air DJ in action at SXSW.
It's amazing how many Bluetooth MIDI products have been developed since the new BTLE MIDI spec was made official a few short years ago.