Yet this thread is bitching about exactly that....
no way... This needs way more confirmation, at the very least that it's not a bug or coincidence. The pause between the audio and the ult is critica to gameplay. Calling BS without further clarification.
Edit - really want to test that. May buy the skin just to see. Horrible design on Blizz's part if true. The rest of the stuff is all cosmetic. But that one is pretty big if someone isn't familiar with it and doesn't run for cover.
Not sure about Mcree, but it does change the ult audio for Mercy(although only slightly) or Hanzo from what I've seen so far.