They already fired Sheldon Keefe and replaced him with Craig Beurbe, and there are a lot of reports stating the Maple Leafs are looking to trade one of the core 4 players, and all fingers are pointing to Mitch Marner.
The Boston Bruins aren't going to look the same next year either as Don Sweeney already said the team needs to get faster and that he is going to aggressive in free agency, but the biggest change is involved with goaltender Linus Ullmark.
Obviously this wouldn't be a 1 for 1 type of trade and the Bruins would probably have to package a prospect and maybe a pick for him as well, but it makes sense for both sides, the Toronto Maple Leafs desperately need goaltending and the Bruins are looking for secondary scoring.