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I can't seem to find my old spoiler thread. So here's to a new one. And we have a very interesting one in fact.
General Spoilers:

06/12 - Executives tied to the show say the fourth-season plan is to add several cast members, including at least one fresh-faced new intern: Meredith Grey's half-sister Lexi (Chyler Leigh) will become a frequent presence with a multi-episode story arc. They are also seeking a new recurring male character to compete with Patrick Dempsey's Dr. McDreamy. Source: AOL
06/08 - Multiple sources are telling me that Isaiah Washington will not be returning to Grey's Anatomy next season. An ABC Studios spokesperson confirms that the actor's contract option has not been picked up, but declined further comment. [...] Washington's rep, Howard Bragman, confirmed the news, adding that his client was informed by Grey's executive producer Shonda Rhimes earlier today that he was not being invited back to the show. [...] Plot-wise, it won't be difficult to explain Washington's absence. In last month's season finale, Burke left Cristina at the altar and moved out of their apartment. Source: The Ausiello Report
05/16 - T.R. Knight will be back next season. Source: Ask Ausiello @ TV Guide
05/09 - Sources close to Grey’s Anatomy tell me that Chyler Leigh has been offered a multiple-episode arc for next season. Source: Kristin on E!Online [Note: Ausiello says that Chyler Leigh was offered a 13-episode arc.]
03/27 - There are also rumblings that Sara Ramirez (Callie) might not be coming back as a series regular next season. Source: Kristin on E!Online
02/10 - I know that casting agents have been in Toronto recently, looking to cast a girl between the ages of 10 and 12 for an arc next season. Now, as much as a great show like Grey's might plan ahead, this seems to be way ahead, if you ask me. So, my first thought is that this girl is Izzie's bio-daughter. Source: Kristin on E!Online [Note: We have seen Izzie's daughter this season. Does this spoiler mean that she'll be back next season? Or is the 10-to-12-year-old girl not Izzie's daughter?]

hmm...cool! that all ought to be interesting...