The Ocean in the Sky focuses primarily on two previously-seen characters: Dorn Jimbal (first introduced in Two Suns at Sunset and Xto Djbbit (the astronaut last seen at the end of The Madness of Kings.) While never actually meeting, these two very different people will uncover important truths about the future of the planet itself.
You’ll find this book answers a lot of the questions, while also asking new ones. It also sets up the second trilogy in the series, which I should probably start writing soon.
Oh, and if you’re new to the series, definitely start with books one and two first.
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