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Din helped Boba when he didn't need to--while Din said there were no strings attached, meaning that it was a service he provided without expecting anything in return, Boba has grown to be more honorable and recognizant of the people who have helped him along his journey .
He has legitemate gripes with the Empire as well, Boba does
If Din comes calling, I would be very surprised if Boba turns him down
To me, the story itself is there if they want to go that direction. Considering how big of a name Boba Fett is, and that this is the movie that is bringing SW back to the big screen (Disney would likely want to do whatever it can to ensure its success), it just makes all the sense to me.
IMO it would be a shortsighted move for them to not include Temuera and Boba, and one I would be very disappointed by. For the weight of Boba Fett's character and the fact that there is precedent in this larger story of Pedro and Temuera's characters working together.
I'd be surprised if we don't see his face in the Mando movie.
but with the nature of the role, and how they've established his character to still be abiding by the rules of the children of the watch, it makes it more akin to the vader role than anything. whereas his voice will obviously be the same iconic voice that it is, but theoretically anyone can play the character physically. Brendan Wayne and Lateef Crowder, the men who are in the suit most of the time, have gotten more recognition this past year or two, which is nice, because IMO they are as much the character of Din Djarin at this point that Pedro is.

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