Here, after many many weeks, is some scoop on the next all-new episode of Grey's Anatomy from Michael Ausiello at TVGuide.com:

I was really looking forward to Joshua Jackson being Cristina's love interest on Grey's Anatomy, so the scheduling conflicts suck! Any updates on who'll be cast instead? Big update: I'm hearing that Shonda Rhimes has handed the plum part to a relative newcomer by the name of No One. Get it? She handed the role to No One. [Hold for laughter and/or crickets] Seriously, my Grey's spies tell me that Ms. Rhimes has decided to put the character on hold indefinitely. Bummer.
I seriously need some Grey's Anatomy scoop. Any hope for us Mer-Der fans? Not in the first episode back, which flashes forward a few months and, per one source, picks up at the end of Derek and Rose's latest date. In that same episode, I'm hearing something about a contest to determine who Seattle Grace's best doc is.