I've been thinking of Jasnah's future in SA 5 and the second arc, and I've come up with two main possibilities:
1. As the Queen of Alethkar, Jasnah reforms Alethi society. She mentioned wanting to replace the current government with something else in RoW (a constitutional monarchy seems most likely) and instituting other changes like abolishing the nahn and dahn systems. After doing all this, she steps down and does something else, perhaps worldhopping, since the surge of Transportation would make that possible for her. She does seem like someone who would want to explore the greater cosmere, especially with what Hoid has told her so far.
2. Jasnah becomes Odium. This theory is a bit more farfetched, but I've seen other people talk about this both here and on Reddit. She's the last flashback character, which (presumably) means that she'll have a large part to play in the back half. Also, in a WoB, Brandon says:
Rayse says that Odium is more passion than hatred, and he gets consumed by that passion. However, Jasnah is shown to be stoic and levelheaded, with an iron grip on her emotions. This would make it much easier for her to tame Odium's Intent and use the passion for something that she has determined to be morally correct. Also, Ivory has said that she is more like a spren than a person and does not "change on simple whims," which might make her much more resistant to corruption under the influence of Odium.
Of course, it's not a perfect solution, but I think Hoid would be hesitant to solve the Odium problem by outright Splintering him, so this seems possible.
The two options are also not mutually exclusive---in the back half, Jasnah could reform Alethi society, step down, and then become Odium.
Also, someone mentioned Splinters of Honor combining with Odium to form some kind of dual shard, which could also be a solution, but I feel like that would be too similar to Harmony for Brandon to do.
What do you think?