There are a lot of things that can be assumed about the next season of Outlander but here are a few reminders of things that we know we will be seeing. If you aren't at all worried about spoilers there is a box you can click on to get the book related "things we know" but otherwise I recommend show fan stay away from the spoilers.
1. It is likely going to be based on the fifth book of Diana Gabaldon's Outlander series called The Fiery Cross. Of course, we are unsure if we'll get the entire book or part of the book. You may not know this but this is the longest book of the first 5 by nearly 400 pages so it stands to reason we will not be seeing the entire book. Also, the PTBs (powers that be - ie our executive producers) have mentioned it might be easier to break up the books a little. I'm rather keen on this idea as I think it would make things feel less rushed.
2. Both season 5 and 6 will have only 12 episodes each. Season 1 had 16 and 2 through 4 had 13. However, standard season on premium channels tend to be 10 or 12. Outlander has been an exception. Losing an episode does support them taking on portions of book rather than the whole.
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