We all know ToO goes up to nine wins but we don't know what happens then. Bungie already sort of reference the nine which relates to Agent of the nine, the Xur. So, I assume when you achieve nine wins in a single passage will give you a chance at the Fate of All Fools (An Unknown Patron) exotic bounty. Then the bounty will be available in Hall of Amentet. This is just a speculation, its not official.