Not strictly Drone related, but if the weight and power requirements are manageable, the new Kinect sensor from Microsoft could be pretty amazing as a navigation/obstacle avoidance/3D mapping tool. And it can see in the dark and read your pulse rate.
The new Kinect for Windows sensor won't be available publicly until some point in 2014, but developers can apply for an early, $400 development kit starting right now (due before July 31st at 9AM PT), Microsoft announced today. In that $400, developers (if accepted) will get early SDK access, a pre-release "alpha" version of the device, a final retail version (at launch), and private access to both APIs and the Kinect for Windows engineering team (in private forums and webcasts). Should you get in, you'll find out more come this August.
Some info on the new Kinect are at this page: Unofficial Kinect Info Page
I have to think a bunch of labs are going to jump on this.