I can't think of any reason why they'd want to deal any of their young talent at this point. Buchholz has been too good this season, and they know he'll only get better since he's still 25. Lester/Youk/Pedroia/Ells are the future of the team, and all pretty cheap. Unless they get a great package, there is no reason to trade any of them.
They will probably look into trading players they might not get back next year. My money is on trading Vmart. Other teams know that his struggles are probably not going to last, he's a FA next year, the sox need better defense at C, and Varitek is doing everything he should be. Replacing him with a defensive catcher to platoon with tek makes the most sense to me. At this point, the Sox won't be losing much by trading him, but other teams could gain quite a bit.