I just received my Kinect for Windows (K4W) v2 dev kit and opened it for the first time on camera:
This is the alpha version of the hardware that is being sent to K4W developer program members sometime very soon. The final version may differ, and the power supply situation will definitely be smaller.
The K4W team gave the K4W MVPs their v2 dev kits today, November 17th, during the MVP Summit. (Microsoft MVP = Most Valuable Professional, which is an award for people to contribute to various technical communities.) The team is also generously allowing developer program members to share and demo the pre-release sensor hardware and applications publicly without any NDA restrictions.
I'll follow up with another video in a few days after I am back home and have set up the new sensor with my computer.
Note: In the video, I said that the model number for non-USA dev kits would end in 2. There may also be a 3 version. The difference is only which power supply is included. Don't plug in the dev kit to power in the wrong country!