Regarding the charge punch cancel, I tested if you hold back+AB it just cancels immediately instead of rolling. In fact, as noted in the change notes, if you press the D to cancel the charge punch too early--it won't cancel. However, the back+AB doesn't seem to have that limitation. I'll need to experiment more. UPDATE: It's the same, turns out you can cancel as fast as you want charging by yourself but when you put it in a combo the D doesn't buffer long enough (s.C, f.B, qcf+C (hold)~D) and the same thing with the back AB.
His cancel is so fast now, at least in the corner I got: s.C, f.B, charge punch~feint, s.A to connect.