Lets see....
Derek will get in a car accident on the way to Rose's (or afterward) and may temporarily lose his memory about who he's supposed to be with. Meredith will move forward with plans to build their house, hoping to help Derek get his memory back.
Callie and Erica will not hook up....but they will tease Dr. Sloan to make him think they did. I don't think Callie is a lesbian or Bi, I think she just likes kissing girls.
Izzie and Alex will not hook up right away, probably not until midway or the end of the season (there will be a lot building up to this).
Bailey's husband won't take her back, he's already moved on.
Lexie will pursue George, but he will tell her he just thinks of her as a sister.
Christina will become a good teaching resident and continue to grow as a cardio thorasic surgeon. She will be the next chief resident.