From her blog, P.C. Cast says -
Both are set in my fantasy world of Partholon, one hundred and twenty five years after the events of my adult trilogy: DIVINE BY MISTAKE, DIVINE BY CHOICE, DIVINE BY BLOOD. Elphame and Brighid are coming of age stories in a fantasy setting. I love these books and am so glad Harlequin is breathing new life into them. I think fans of House of Night will adore them!Here is a comparison of the new and old covers. P.C. Cast has images of the full cover flats on her blog. I haven't read these, but being set in the same world as the Divine series I expect they will be terrific. The new designs certainly mesh well with the modern look of the Harlequin Teen line.