You have to think the Avs will try. There's two reasons he would have been included on the trade: either the Avs like him and asked for him, or he told the Rangers he wouldn't sign and they threw him in as a bonus. If it's the first one, the Avs will push to get him signed. If it's the second one, maybe Kempf just really wants to try for UFA no matter what, and he might walk, which is disappointing but probably not a huge loss.
At the time of the trade, CMac was pretty clear that they liked him.
He said that Kempf is a guy their scouts have watched a lot and they have good connections/communication with the staff at Cornell to be able to monitor him closely and get updates.
Sam2's D partner when they signed him I believe.