I said that it's probably just the different way that Softkinectic is doing it's skeletal tracking. But it makes the Kinect skeletal tracking seem tied down in comparison.I see no difference. Just because the people are moving more in the forwards/backwards axis (if they are - looks to me just like a wider angle lens in effect), doesn't mean the tech is any more capable. You only need one example of Kinect tracking a person moving forwards to prove it can, and that exists in the posted videos.
Show me a Softkinect clip for PS4 of someone pale wearing a light top against a light background punching forwards with a decent measure of z-velocity...
And also, it doesn't matter. The skeleton tracking algorithm is separate from the depth acquisition method. Softkinect using Kinect 2 would have exactly the same abilities.
The free movement is probably not such a good idea for playing games in your living room anyway might have people running into the TV & stuff.