The Pacioretty rumors all began a few weeks ago when he wasn't scoring and started questioning Therrien's game plan (defensive hockey- Habs lead the league in blocked shots by a wide margin...), and also wasn't happy about the benching of his very good friend Desharnais. Add to that, the fact that he fired his agent a few weeks back, after signing a long term deal last year, and everyone figured he wasn't happy in Montreal.
Now he's on a tear, and I don't think Montreal would trade him for fear of fan reaction, as he's pretty popular here, and probably just as liked as Price and Subban. The local media have speculated that he doesn't look happy, and its probably an issue with the coach. The concerns are that he plays a perimeter game and doesn't go to the dirty areas often enough, and relies on his speed to create chances and score goals.
I have always thought that Kreider reminded me of Pacioretty, as they both have great speed, size and strenght. I doubt Montreal trades him to us, since they're looking for size up front, which we clearly don't have. I seriously doubt we trade Nash, so I really don't what would be of interest to both sides?