GRR Martin's Game of Thrones (A Song of Ice and Fire)

[Vampyr]

Since some of the books are missing major characters, I wonder if they'll just take the next 4 available and turn them into 5 - 6 seasons worth of episodes, and move things that were happening concurrently with the missing characters up into episodes alongside stuff that was actually happening in the book?

I don't see any other way they could do it that would make sense.