At least according to ESPN
This is a great move. Swisher is a solid player coming off a bad, but mostly unlucky, year. I forget if he's signed to an extension or not, if not, they've got at least 2 years of a decent, young outfielder who can play all 3 positions.
Marquez probably falls into the class of guys the Yanks traded for Nady/Marte - serviceable, but not much more than 5th starters. In the Yanks case, he's already behind Hughes, Kennedy, Aceves, Giese, Brackman, etc. so they're not giving up a piece that they're going to miss.