Per Jerry Crasnick at ESPN, the Yankees have acquired Nick Swisher from the Sox for minor league pitcher Jeff Marquez.
Marquez is a 24-year-old righty who spent most of last year at AAA Scranton Wilkes-Barre. He went 6-7 with a 4.69 ERA in 14 starts. 33/24 K/BB in 80 innings. Don't know what his pedigree is, but he was the 41st pick in the 2004 draft.
Looks like Wiliams and Sox did undervalue (at least relative to the opinion of many here at RR) Swisher.
I guess we can put that rumor to bed.