WWDC21 announces the support of more body poses and gestures for processor A14. Furthermore rotations are more accurate and you can track these movements from a larger distance.
But what are the improvements for devices with processor A12 or A13? Do they also benefit from any improvements when using ARKit 5 and iOS 15?
It is not even possible to test the motion capture improvements since with iOS 15 Beta 2 motion capture does not work at all. Refer to this entry