I think his positioning for rebounding is only slightly better. But he looks about 20lbs bigger this year, and I don't see him being knocked off-balance as easily (on both the offensive and defensive ends). I think that's helping him come down with more boards, and establish better position in the low post on offense. Now, whether he can do anything if we actually feed him the ball, that's a different story.
But I agree, there's not much to complain about his play so far.