Where's Jorah?
The last time we saw Jorah Mormont, Daenerys ordered him to go and find a way to cure his greyscale, a disease that leaves flesh stiff and dead and eventually turns the sufferer into one of the Stone Men.
Though there are rumors about what can stop greyscale — from prayer to vinegar — there's no known cure. Hopefully, Jorah is off somewhere where he can find the cure he so desires.