That was a long half-day of Surface exclusivity. Xbox SmartGlass, the app that connects your mobile device to your Xbox, is now on Android. So you can use your Android phone or tablet to make people dance
for your amusement, track achievements, do avatar stuff, and eventually interact with other Microsoft Studios games and other Xbox stuff.
An iOS version is also expected; the last timeline we heard from Microsoft was 2013
, though that was supposedly the window for the Android version as well.