Prince of Persia Facebook page, that those who pre-order Prince of Persia: The Forgotten Sands from GameStop will receive an exclusive new game mode. The offer, incidentally, applies only to the Xbox 360 and PS3 versions, so PC and Wii gamers are out of luck.
The bonus mode is entitled Forgotten Arena and tasks players with defeating "waves of relentless enemies" in classic survival mode style. There is no time limit, killed enemies will regenerate health and the number of enemies increases over time. The description also notes that players who can defeat 100 enemies "may have what it takes to become a real Prince of Persia," though it's unclear if doing so will unlock any actual rewards or any actual royalty.