Right now, things on Grey's Anatomy are … unstable. There are a lot of things up in the air: Bailey’s (Chandra Wilson) marriage, Adele’s (Loretta Devine) life, Meredith’s (Ellen Pompeo) pregnancy, Cristina (Sandra Oh) and Owen’s (Kevin McKidd) marriage, and the list goes on. Nothing is guaranteed.

That being said, we recently learned of a few things that are guaranteed for Season 9, Episode 12 “Walking on a Dream.” According to an ABC Press Release, here is the official synopsis for the Jan. 24 episode:

“The Seattle Grace doctors are on edge when a new medical professional enters the hospital; Arizona struggles with the emotional and physical pain of a phantom limb; and while battling pregnancy hormones, an overly-emotional Meredith is confronted with her worst fear.”

The press release also states that Episode 12 features guest stars Constance Zimmer and Justin Bruening. So basically, there’s a new doc in town, Arizona (Jessica Capshaw) is still struggling (which probably isn’t good for her relationship), and Meredith is going to cry … a lot. But what is Meredith’s worst fear? Becoming her mother?

Catch the next new episode of Grey’s Anatomy on Thursday, January 10, 2013, at 9 p.m. ET/PT on ABC.

Source: ABC Press Release

Samantha Highfill is a contributing writer to Wetpaint Entertainment. Follow her on Twitter at @samhighfill.