Here's all the scoop from Ausiello at TVGuide.com:

Do you have any good Grey's Anatomy scoop?

Since Burke's never coming back, Shonda Rhimes went and got the next best thing: his mama! Yep, Diahann Carroll's returning in this season's second episode when she shows up at Seattle Grace to get that choker back from Cristina. Needless to say, her return is shocking — and potentially clarifying — for Yang. It's also funny as hell. In fact, I hear the entire episode is high-sterical. There's also apparently some great stuff with Chandra Wilson as Bailey struggles with no longer being the boss lady.

There's a rumor going around that there's a big Mer-Der sex scene set in a shower in Grey's third episode. True?

Ausiello: False… although the word "bathroom" is uttered at least once in the episode.

Have you heard anything about Edward Herrmann's character on Grey's Anatomy?

I hear Grandpa Gilmore's playing the world's oldest intern.