Conquest PvP vendors will be making a much awaited return to WoW in the Shadowlands expansion.
Not much has been revealed yet, but an official Blizzard blue post stated;
Also of note are some changes to PvP currencies—notably, Conquest is once again a spendable currency earned through Shadowlands Rated PvP. Players will be able to use Conquest points to purchase specific items of their choice from a vendor in the capital city of Oribos (in an easy-to-find location, naturally). Conquest can also be used to upgrade that gear further (similar to how Benthic gear worked with Manapearls in Rise of Azshara). We’ll have lots more information to share on the details of this system, as well as our broader endgame itemization plans, as the alpha rolls on and we reach max-level content.