Here's the scoop from Michael Ausiello at TVGuide.com. Grey's Anatomy finally returns on April 24th with five all-new episodes.

That's great about Mer/Der getting back together for good this season, but what about Seattle Grace's other star-crossed duo — you know, Gizzie? It's with overwhelming joy deep regret that I inform you that Gizzie is no more. Sources confirm that the ill-conceived plot twist suffocated to death under the weight of its own absurdity shortly after the writers returned to work last month. A private memorial service was held in early March at the home of Shonda Rhimes. In lieu of flowers, fans are asked to keep the "thank gods" to a low roar….
Got any clue as to what's going to happen when Addison returns to Grey's Anatomy? I've actually got a big clue and here it is: Addison just so happens to stop by Seattle Grace on the same day a patient is admitted to the hospital with a neo-natal-type emergency. What are the odds?!