With all the focus on Cristina, Owen and Teddy (new cast member Kim Raver), what's the status on Grey's Anatomy's "signature" couple? We've been hearing so little!

While we would never forget about MerDer, Ellen Pompeo's recent maternity leave and plenty of other drama have put them on the back burner a bit. So what's next?

TV Guide has an interesting teaser in its spoiler Q&A segment today:

Q: Should I be worried about Mer and Der on Grey's Anatomy?

A: Rule No. 1 of marriage (Post It or otherwise): Never let slip something your spouse told you in confidence. Derek will learn that lesson the hard way when he blabs one of Meredith's secrets around the hospital. While Derek will definitely be in the doghouse, the secret's impact will be much more wide-ranging at Seattle Grace-Mercy West.

What do you think the big secret is?

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.