PvP: Coming with housing in 2.1. It'll be small-man teams 4v4 iirc

Mounts: Don't forget the Unicorn(CNJ30 additional quest)

Free Companies: Like ForteXX said, they're XIV's player-run guild system. Can have up to 15 ranks atm(checked personally for the limit)

Costumes/Vanity: Planned for some time after 2.1, don't know if they've said for certain when or what patch