Yes, they will have a rematch. Wlad said it in the ring. It was part of the contract and was in every Klitschko fight.
I think once Wladimir sits down and watches it he might not want a rematch, it was that one sided in my opinion. I do not see what Wladimir does to change that sort of result, if he throws more punches he leaves himself open and Wladimir doesn't do that. Wladimir just might have met his nemesis, there is always one fighter that has your number and to me it looked like Fury has his. Fury can write his own cheque, there are some monster money fights out there for Fury if he want them.
Tyson should try to unify or defend against Wlad But Wlad may indeed be done. He Don't seem to have it anymore. That has been shown in his two recent fights.