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Kinect 2
Hardware
Kinect 4 Windows 2 comes with a breakout box which basically converts from a custom power supply plug with 12V and 5V & a standard USB3 B-style socket to the proprietary Kinect connector. Currently, it seems like the Kinect 4 Windows 2 itself is identical to the Kinect One from the Xbox, whose internals are already extensively covered at iFixit: http://www.ifixit.com/Teardown/Xbox+One+Kinect+Teardown/19725
PCB top view with Kinect socket + debug connector
Kinect socket with pin numbers
Pinout & Kinect cable wire colors (as per https://i.cloudup.com/gsEOYAqIDS.png). Some cables use 2 shades of brown instead of red/brown for 5/12V:
1: 5V (from PSU), red (or light brown)
2: D+ (USB2), green
3: D- (USB2), white
4: GND, grey
5: 12V (from PSU), brown (or dark brown)
6: GND, black
7: GND, black
8: Unknown (probably debug signal), white/black -- goes together with pin 1 (5v) providing differential signaling; Leave it not connected
9: StdA_SSRX+ (USB3), orange
10: StdA_SSRX- (USB3), purple
11: GND
12: StdA_SSTX+ (USB3), yellow
13: StdA_SSTX- (USB3), blue
All grounds/shielding are connected internally.