Looking at the footage again, the arms don't appear to be overly long. The position of the elbow appears to be just above the waist, consistent with human skeletal structure. The hands appear to swing at mid-thigh level, again consistent with human biology. Stand up straight and put your arms by your sides, your hands will reach to mid-thigh. Hunch over a little and they will swing just above knee-level.
Skeletons of primates, however, hang well below knee level.
Add to this length the extended fingers of a large suit 'glove' and the arm length doesn't appear to be anomalous. Also, the fingers never seem to clench or change position, a movement which would be difficult with a suit with slightly extended fingers. Try clenching your fingers while wearing a large glove; the glove will simply flip in half.
Sure thing, Jedi.
