Dallas: seems like they will try to resign Duchene and he loves it there. I remember in the Spittin Chiclets interview, he said he didn't even know how much he signed for; he just wanted to go there. Tyler Seguin seems like the obvious guy for them to trade with that cap hit. 2x9.85. Nill is an excellent GM however so I'm sure he will manage just fine.
Vegas: surprisingly, they will have 16.7 million in cap space. They need to resign some role players (especially goaltending), but no star player. Eichel is due for a contract next offseason but don't think it'd be an issue with the rising cap (and Pietrangelo/Stone likely sign for cheap the next year). I could see them making a push for Marner in classic Vegas fashion. If they want to clear up cap space, William Karlsson is the easy target for us. We would be sending Newhook (and more) the other way since I'm sure they'd want some NHL middle 6 guy. He's got a 10 team NTC which we are likely on.
With the rising cap, I can't see many teams being desperate to get cap space anymore meaning the Laine/Monahan trades are less likely to happen. Not really sure what we can do realistically. I refuse to believe Hughes is dumb enough to add only guys like Mercer and Gralund.