Leap Motion Orion →
Impressive engine improvements, and a really neat launch trailer. It's surprising how much better Leap Motion was able to make their 3-year-old device without new hardware. This comparison video from UploadVR shows off the myriad of occlusion and tracking enhancements.
Another cool note, via The Verge:
In the second half of 2016, particularly during the holiday season, Leap Motion expects "several" VR companies to release headsets that incorporate its Orion sensor.