In an article for Ausiello's blog, Shonda Rhimes writes a bunch of spoilers on what drama we can expect to unfold for the rest of the season -- which will be drama leading up to the "game-changer" finale!
* Derek and Meredith are going to have a very serious conversation that may or may not involve the word “baby.”
* Teddy is going to find herself fighting for her job.
* You’re going to see what happens when two Karevs get in the same room together.
* Callie and Arizona and Mark are going to do something dirty with pound cake. They were going to do something dirty with mini-muffins, but Broadcast Standards and Practices said no.
* Sloan Sloan comes back to have Mark’s grandchild.
* A 700-pound man comes to Seattle Grace and our residents have a hard time remembering their sensitivity training.
* Mer is gonna go a little badass and protective on Owen when it comes to Cristina.
Source: Ausiello Files