Not sure how I missed this for so many months...
"The new series, the first of which is titled The Desert Prince, will take place 15 years after the ending of The Core telling the tales of two young protagonists, Olive Paper and Darin Bales, and featuring Demon Cycle characters and settings."
thebookseller.com/news/harpervoyager-snaps-brett-high-six-figure-deal-766531