When we last left our Grey's Anatomy gang, we found out that Derek got the funding for his Alzheimer trials. It seemed to a given that his wife and muse, Meredith, would be the one to help him out.. check out these spoilers and see whether this assumption will hold true on the upcoming episode of Grey's Anatomy!
When will Derek start his Alzheimer's trials on Grey's Anatomy? — Alison
NATALIE: Soon. But don't think he's going to change his mind about working with Meredith. He's still concerned that adding his wife to his team will adversely affect his judgment, so he chooses another resident. That decision will turn Dr. Grey into a green-eyed monster.
Source: TV Guide