The new Leap Motion device lets your devices "see" ten-finger motions in real-time 3-D. I see no published patent application yet, but the device is described on the website.
Microsoft has applied for a patent to use this kind of data to wave your hands and invoke software magic: US patent application 2012/0275686. This includes the use of wands in claim 20 and incantations in claim 5.
"Good Case": Say Microsoft has been busy making sure this device works seamlessly with Windows 8 PCs, phones, and tablets on a plug & play basis, shouldn't they be rewarded for their efforts?
"Bad Case": Say Microsoft still has nothing better in mind than use with the XBox 360 Kinect. Should they be allowed to prevent third party developers from integrating the Leap Motion device with Android Phones and iPads?
Reality may be somewhere in the middle. The Leap Motion device enables new ways to interact with our devices. What should it take to pass the "obviousness" hurdle when an O/S adapts to a newly invented device?