Guys, we've finally got some concrete spoilers for you guys next season: a guest star spoiler! Check it out for spoilers on who else we can expect on the next season of Grey's Anatomy!
For those who followed Mercy and Men in Trees, this spoiler will be especially sweet: James Tupper, who starred in both tv shows, will be guest starring in Grey's Anatomy as Andrew Perkins. His character is described as "a trauma counselor brought in to help Seattle Grace recover from that nightmarish season-ending bloodbath" and is slated to appear in at least 2 episodes.
No other spoilers about his character yet but we'll let you guys know as soon as we know!
Source: Ausiello Files