I don't see them trading him, simply because I don't think anyone really knows what he's worth. He went from being a top prospect to a top pitcher in 2008/2009, who then lost his confidence when he failed in the majors, then had a rough start to 2010, but eventually came back to have a stretch of really great starts in 2010, and so far he's been an exceptional reliever in AAA. Unless a team they're trading to values him highly, I see no reason to trade him-- just look at his stats in the minors, overall they still look incredibly good.