Here's hot-off-the-press spoilers from Mike Ausiello over at TVGuide.com, who's got some very interesting scoop for us this week.

I'm freaking out over last week's Grey's and all the rumors about Meredith dying. There really is no Grey's Anatomy without our favorite Grey! Please talk me down from the ledge!

If this week's CSI: Miami taught us anything, it's that a major character can die and still live. Now get your drama-queen ass off that ledge!
No frakkin' way! For Papa Smurf’s sake, Meredith is totally going to be saved by McDreamy, right?

(Spoiler alert) Actually, I'm hearing it'll be someone else who's ultimately tasked with saving Mer.
Do you have any more details about Denny's return to Grey's?

Sure do. First off, forget what I said about his episode airing later this season. Although Jeffrey Dean Morgan only taped his scenes last week, the Big D is actually coming back much, much, much, much, much sooner. And you know that list of far-fetched Denny-comeback scenarios I compiled in the Ausiello Report? Turns out one of them's not so far-fetched.
You were right: The first part of the Grey's three-episode arc was fantastic. Do you have any spoilers for the next two episodes?

If you put two and two together, you already figured out that that was Elizabeth Reaser playing the pregnant woman with the crushed face that Alex saved. In the coming weeks and months (Reaser's on board for at least nine eps), Alex's attachment to her will intensify. And if you thought Reaser's character had it rough last week, just wait. Another tragedy is about to befall poor Jane Doe.

• Kenny, Denny's long-lost (and, natch, evil) twin. Just as Izzie is starting to feel a little bit merrier about being Denny-less, her ill-fated mate's doppelgänger shows up on her doorstep to claim his share of her $8.7 million inheritance.

• A ghost. At the opening ceremonies of the Denny Duquette Memorial Clinic, the dearly departed's spirit appears just in time to cut both the ribbon and the tension. At that moment, Burke drops dead of a heart attack, and, as Izzie looks on, radiant, her beloved offers to serve as Dr. Crankypants' escort to heaven.

• Denny's corpse. In a very special installment titled "Grave's Anatomy," Izzie suffers a Denny-fueled relapse, races to the cemetery in her wedding dress, digs up his grave and crawls into the coffin with what's left of him. Snow Patrol's "Chasing Cars" plays in the background. Of the entire hour.

• An ET. Yeah, yeah, I know I said this isn't The X-Files. But in a Roswell-ian twist, a Denny look-alike could beam himself into Seattle Grace as a spaceman suffering from an acute case of, ahem, alienation. He takes an immediate shine to Izzie (as so many fellows with this particular face do), but he mysteriously insists on calling her Isabel.

• A war correspondent named Jack who checks into Seattle Grace to undergo an emergency tonsilectomy. While prepping him for surgery, Izzie pops the question and the two tie the knot. Unfortunately, the marriage ends when Jack gets called off to war and is spun off as Shonda Rhimes' new ABC pilot about war correspondents who may or may not have pretty exes back in Seattle.