As the guys from Southpark would say, Arya could have used a montage'. She could have been trained up in one episode and be killing folks by now.

Not sure if anyone wants to look it up but there was a redditor post that outlined most stuff happening this season. I read it but I am not putting it on here just in case it is true and it is major spoilers. It got some traction because part of the post has been right on so far.

I wonder if the Iron bank comes into play at any time. At this point in the book, the Iron bank is making its presence felt of course they were backing Stannis also but in the show that wouldn't go anywhere now.