The gestures can also be done by using the motion sensing of the nunchuck but not the leaning.
The leaning can easily be done with the move controller but sony shot themselves in the foot by not including any motion sensing in the navigation controller.
So you need a move nunchuck combo, or a kinect wii combo.
Body tracking on the ps-eye is very iffy, it works under the right lighting but who wants to play an fps with all the lights turned up?
Next gen we'll probably get an all in one solution. I don't think microsoft will bother to release yet another peripheral to work with kinect. Kinect the standard 360 controller might be used, but having to hold the controller with 2 hands will severely limit its use.