The Prince of Persia series in the last generation of consoles was one of the most successful and critically acclaimed series to come out during its era. Therefore, it is no surprise that Ubisoft would want to continue it on the current generation of consoles. The problem was that there was really no room to continue the story after it was so perfectly tied together with its final chapter. The solution? An interquel! Thus, we have the Prince of Persia: The Forgotten Sands.
Naturally, the only place to expand on the trilogy would be in the seven year gap between the first chapter in the trilogy; The Sands of Time, and the second chapter, The Warrior Within, since the third chapter. The Two Thrones, took place immediately after Warrior Within and left no room for expansion (unless they wanted to go more in-depth about the Prince and Kaileena’s relationship on that boat of theirs… probably not a lot of gameplay there, but it might provide us with some interesting mini-games). In order to leave more room for later expansion and maybe the return of the Warrior Within’s nemesis, the Dahaka, Forgotten Sands takes place immediately after Sands of Time.