Next Season: Possible scenarios
Carter and Abbey get married
Benton returns, He is married to the female peditrician he was seeing when he left.
Ramano throws himself off the building, or, he is the most arrogant and toughest teacher in med school gets accused of harrassment by students, turns out he is trading grades for "favors"
Luka comes back. with the nurse from the jungle in tow. HE announces they are getting married.
Carrie and the firefighter have a successful pregnancy
Lizzy begins to become romantically involved with another Dr. but has flashbacks of her time with Green. Goes to counseling, builds a relationship.
Pratt and Gin Na get married, they then go for custody of her adopted child.