The New York Yankees made a pair of moves over the offseason on the same day, acquiring Michael Pineda and Hiroki Kuroda on the same day. The former got hurt, and the latter's been a success. They still have Freddy Garcia in the rotation, though, and they'd like to consider an upgrade. Enter Ryan Dempster:
That's in response to a) a rumor about the Yankees being interested in Dempster, and b) the fact that Dempster was already reportedly dealt to the Braves before rejecting the deal with his 10-and-5 rights. If Dempster's already cool with the Yankees, there's a greater chance of the deal happening.
At the very least, the intrusion of the Yankees gives the Cubs a little more leverage over the Dodgers. The Cubs were pushing for prospect Allen Webster as a part of the deal, but so far the Dodgers have been refusing.