My feeling is that MK decided to do Montreux this year because he knew it would be filmed.
It doesn't mean that he would allow nor expect a release.
Video -official or not- is definitely not his thing.
But he is a major artist and he knows that he must do something.
Montreux is just what he needs : professional video, minimum involvement for him, no stress.
In a couple of months or years, MK just has to give them a call : "let's release".