Jon Snow is dead. Yay! No, really, that's a good thing.

So, is the show completely to mostly off book now--and, technically, yeah, since book six not out yet--or what...?

My opinion. Jon Snow is dead. Yay! He can be temporarily dead then breathe again, knowing he has served his full watch on the Wall and can now move on to higher, greater things to protect us all.

Like discovering that his dad was his uncle and that he is more closely related to the Dragon Queen....

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 Game of Thrones, Season 6: Hall of Faces Tease (HBO) at YouTube