Just to break things down for you, instead of A) trading Montero for Cliff Lee a couple years ago, or B) keeping your best hitting prospect, the Yankees traded him for a guy who had one good half of a season and is now headed for shoulder surgery. Fantastic!
No word yet on how long Pineda will be on the shelf, but I can only assume it will be a while. People are speculated that he'll be done for the year, and the only info I could find was that an injury like this normally takes 3-6 months to recover. I'm not sure if I've mentioned it before, but what a great trade!