Lots of stuff has been added, here is the list:
/Auctionhouse or /ah | Setup a shop everyone can access
/Forge (or in /open) | Combine artifacts to get a better one!
/Boardgames (or in /minigames) | Play a bunch of games with friends!
/Vehicles | You can now purchase Flying, driving vehicles with ingame money!!!
Items have also added to /buy!