Mods, I don't know where to put this, we don't have a Season 8 section yet...
This video is interesting...it's 10 minutes long:
Basically he says, season 8 scripts are in. The belief is each episode might be close to 90 minutes long. They are going to need a longer post production time due to having to film more with the Night's King, dragons, etc, hence the belief of a 2019 air date.
The supposed season 8 leaks, he says, are fake.
Also says some of the filming locations are being set up, most notably where they filmed Riverrun. He speculates this means the return of Edmure Tully in some fashion. Interesting, if correct. Depending on what happens to Tobias Menzies characters this season on Outlander, he might be free to film for season 8.
It could also mean as Jaime goes North, perhaps he's the one to stop in Riverrun again?
Filming will begin in October like it did last year.