To be completely 100% accurate (and pedantic), it's Jeyne Poole, being forced by the Lannisters to go to Ramsay, posing as Arya to marry him, in order to solidify control in the North. So far, the changes they've made are definitely less convoluted and byzantine than what happened in the books.
So it sounds now like Brienne is going to play the role of Sansa's savior once everyone realizes what's going to happen, replacing the "disguised" (and now dead) Mance Rayder and his wildling girls and attempting to get her out. It will be interesting to see how much Theon's story changes or doesn't in this new context. Sadly, he seems to have been relegated to a minor recurring character now. Brienne and Theon may both likely assist getting Sansa out and, while on their way to the Wall, runs into Stannis' army on the march to retake Winterfell. They will likely bypass Stannis' currying of favor from the Northern peoples while he's on his way. Brienne loses her shit when she sees him and hilarity ensues. That's my prediction based on where things are going at present.
Danny's story has become predictably boring, just like in the books, and Tyrion's story has become extraordinarily abbreviated. No traveling down the Rhoyne, no Young Griff, no Stone Men. He should be in Meereen by next episode. How big is the continent of Essos again?
So it sounds now like Brienne is going to play the role of Sansa's savior once everyone realizes what's going to happen, replacing the "disguised" (and now dead) Mance Rayder and his wildling girls and attempting to get her out. It will be interesting to see how much Theon's story changes or doesn't in this new context. Sadly, he seems to have been relegated to a minor recurring character now. Brienne and Theon may both likely assist getting Sansa out and, while on their way to the Wall, runs into Stannis' army on the march to retake Winterfell. They will likely bypass Stannis' currying of favor from the Northern peoples while he's on his way. Brienne loses her shit when she sees him and hilarity ensues. That's my prediction based on where things are going at present.
Danny's story has become predictably boring, just like in the books, and Tyrion's story has become extraordinarily abbreviated. No traveling down the Rhoyne, no Young Griff, no Stone Men. He should be in Meereen by next episode. How big is the continent of Essos again?
And sorry, in my eyes, Jon Con>Jorrah, in general I enjoyed the crew of the Shy Maid more than Daenery's entourage with their repetitive names and annoying linguistic quirks(Thankfully no one in the show is referring to themselves as "This One"
). I wished Martin had saved them for some other story. 
