Jedi Bibliothek found a description and an author for Journey to Episode VII: The Fall of the Empire/The Rise of the Rebellion. Claudia Gray will write the book, which sounds like it focuses on original characters:
Star Wars meets Romeo and Juliet in this epic YA novel that follows two best friends who find themselves on opposite sides of the war between the Empire and the Rebellion.
This thrilling YA novel gives readers a macro view of some of the most important events in the Star Wars universe: from the purge of the Jedi in Episode III, to the beginnings of the rebellion in Star Wars Rebels, and through the fall of the Empire in Episodes IV-IV. Readers will experience these major moments through the eyes of two best friends who grow up in these troubling times, and find themselves on opposite sides of the war.
As with other Journey to Episode VII titles, hints about the upcoming film will be included in the narrative, as well a original, post-Episode VI content that sets up the new film.
So these books may not be as full of potential spoilers as we may have originally expected. Later:
Chapters alternate perspectives between our two protagonists–one a Rebel pilot, the other an Imperial officer. By exploring these two different worlds, readers will experience many of the major moments in the original Star Wars trilogy–from the destruction of the Death Star, to the battle of Hoth–through these two characters’ eyes.
I’m not at all familiar with Gray’s previous work aside from recognizing a few of the covers, but she is described as “a lifelong Star Wars fan.”