WoW Warlords of Draenor: Remaining mounts

Grinning Reaver - You can buy this mount for real-life money from the Blizzard store. You can buy it from the website and in the game. It costs 25$.

Solar Spirehawk - You can obtain this mount after you kill Rukhmar, in the Southern part of the Spires of Arak, who is one of the Raid bosses.

Ironhoof Destroyer - You obtain this mount after you kill Blackhand, at least at the Mythic difficulty level, during the Raid.

Cindermane Charger - This Mount becomes available after you invite a friend to the game, who starts an account and plays the World of Warcraft.