The below link is analysis for the 4.24 drop. Its very long - 45 minutes, but it includes some impressive research, cross references, and speculation. There's some jibber jabber of course, but i found it a worthwhile watch.
Here's a random thought. After re-reading 5th book, I was struck by how the Boltons sowed the seeds for Theon's escape. Overly confident in Ramsay's brainwashing? The one Theon shot in trailer shows dogs - Ramsay's girls. I think it would be funny if the girls track Theon and then don't attack him because they recognize him as one of their pack. #backfire I'll tack this on, it would seem out of character if Ramsay sent out some of his crew and his girls to find Theon and Sansa. He's want to be on that hunt, right?
https://www.youtube.com/watch?v=lHTcr3bM59o