Last we heard, Grey's Anatomy showrunners were looking to cast actors to play a young Ellis, a young Richard, and a 4-year-old Meredith but no other details. Well, here are more spoilers about that episode!
Question: Could we have some Grey’s Anatomy scoop, please? —Katie
Ausiello: The show’s big flashback episode — slated to air in February or March — will reveal the toll Ellis’ demanding career (as well as her affair with Richard) took on a 4-year-old Meredith. There’s also buzz that the episode will show us Bailey’s days as a Seattle Grace intern and introduce us to the Nazi supervisor who schooled her.
Source: Ausiello Files