I do not believe there will be any penalty. Furthermore, I think the Pats will get sort of an apology from the NFL, but it will be a limp weasley apology because that's the way the NFL rolls.
They can't afford the fall out from Brady/Bundchen and Belichick. I expect Belichick to make it privately known that he will resign and drop a ton of bricks on the NFL if there are sanctions for something he and the team didn't do. I'm sure that Belichick is a big threat to the NFL.
Brady/Bundchen are not prevented from filing legal action against the NFL. The clown show nature of the leaks from the NFL leaves them exposed.
I think Kreisel will quietly retire. He is so obviously the leaker, he might as well have let Mort use him as a named source.