I can’t see Zenos leading into a new story or qualifying as a mystery, the guy didn’t exactly have anything to do. Best guess would be just broadly “aliens” as the new thing, it certainly feels “you went that far, mystery, and next chapter” tier. Corvos and the missing dragon, along with the southern continent, all feel like things to explore too, so it’s hard to say if the next chapter is big or small for which one is more important.