Rosenthal has the ins with the A's front office. Or maybe Chris Kusiolek does, who does his best Chris Cotillo impression here:
It had to be one of Smith or Callaspo, and now we know. This does not rule out a Callaspo trade, but he is safe for now. In Gregerson, the A's get a quality reliever, who K's almost a batter an inning and keep his walk rate and home run rate down. With Cook, Doolittle, Otero, Johnson, Blevins, and now Gregerson (and maybe even Anderson) the A's have a very strong bullpen going into 2014.
Also, RIP Hyundai Sunday.
Update: Team Confirmation: