A paper published at a peer-reviewed journal talks about the positive effects on using Kinect games for helping children with motor impairments and eye-hand coordination problems.
The title of the paper is: "Evaluating Learning Effectiveness of a Kinect educational game for with hand motor impairments and eye-hand coordination". More details at the International Journal on Interaction Design & Architecture (IxD&A), journal: special issue N. 19 on "Games for Learning".