Well this is a huge nothing burger.
Of course they will have him back
Trotz has an immense amount of leverage with the Caps. They left him hanging all year, extended his GM and I heard that the owner wasn't enthralled with him and publicly stated as much, and he just won a Cup. The Caps have zero leverage with him.
Trotz might go to the Islanders. If not there, then he can sit back and wait until next season starts. When coaches start falling, he will be the first name mentioned for every opening.
I'm going to guess he gets a minimum of $5 million for 4 or more years somewhere.