There is a well publicized arbitration deadline, whereby teams have to offer it by a certain date, like, two months ago. It's as binding as the term "deadline" sounds. Once they commit they're in.
On another topic, does anyone know how the arbitration process actually works? Is it something that is based at all on each sides arguments? In other words, with all of the Sox current fancy metrics and their ability to articulate value in 500 languages, is there any interesting discussion here, or is this a "HR", "RBI" kind of deal? The going rate for DH's is pretty low; regardless of their offensive value, they should subtract a reasonable amount for s***** baserunning and no fielding and no ability to field even if they need him to.
Instead they will probably pay thru the nose. Bummer.