I feal that Sansas Vale storyline is the hardest story to predict because it can go in so many directions .
- Will Sansa just stay in the Vale and learning how to play the game?
- Will Sansa take the KOTV North? Or will Littlefinger use them to get controll over the Riverlands?
- Will the mountain clans attack ?
- Will Mad mouse kidnap Sansa?
- What to expect from Harry the heir? Is a evil prick who will rape Sansa?
- Will Sweetrobin die?
- Lyn Corbray , what
I think Sansa goes through her own wildling arc in the Vale (parallel: Jon and Tyrion). I think the mountain clans attack the tourney. Similar to the fighting pits where the stage fighting became real when the dragon showed up, I think the tourney will go from chivalrous sports event to a deadly battle very quickly. This event also explores the consequence of Tyrion arming the mountain clans: they're much more deadly and bolder now.
Then I think she'll be stolen by one of the clan members