She's going to be Lady Stoneheart, if the books are anything to go by. Y'all remember that role at in the role description, right? Maybe the Starks could help you find her before she causes complete mayhem and ruin. I don't know who it is, and I won't jeopardize my house by trying to guess.
EDIT: and no, gimmiepie is not Bryce. The quote clearly says his master, as I highlighted earlier.
This WW seems easy to predict (going after the experienced players), and if my hunch is correct, CB is the new Wight. I can't confirm it; all I can confirm is CB was a Targaryen early last night.