I was brave and tried to demonstrate *live* an Arduino controlled LED lighting matrix with a Bluetooth Low Energy interface all from a Qt application on my Android phone. Sadly the soldering had taken a bit of punishment and the demo failed spectacularly. The audience were great though. Nobody threw anything at me anyway :-)
You can watch the whole recorded session here:
Last week I was in Munich at the "IoT from Sensor to Cloud" conference talking about the Bluetooth roadmap. And next week I'm in Sweden speaking at Oredev.