One thing that hasn't been mentioned in this thread is the respective costs. Many of you may have noticed that Sony has been virtually giving away the PSEye recently, as I picked up EyePet for my kid for only £25 including the PSEye....so it seems that Sony is trying to flood the market with PSEye's so that PS3 owners are prepped for the Wand, which will more than likely cost the same as a controller.
Natal on the other hand looks as if it could cost quite alot, unless MS take a huge hit on sales.
Although Natal looks good, I just can't see most people enjoy playing games without a controller of sorts in their hand. It seems that Sony is trying to get a little bit of Natal and a little bit of Wiimote....it could work really well.
Prediction (June 12th 2017)
Permanent pricedrop for both PS4 Slim and PS4 Pro in October.
PS4 Slim $249 (October 2017)
PS4 Pro $349 (October 2017)