In a recent podcast with Wassup Conversations, Jordan Mechner, the creator of Prince of Persia franchise claims that his new book "Samak the Ayyar" based on an old Persian folk was supposed to be a new Prince of Persia game. He mentions: "It was actually going to be a new instalment in the Prince of Persia series." But the project didn't come to an end and Mechner release the story as a book.
The book is straight-up a brand new Prince of Persia.