Premium account is enabled and will be available since very start.
Due progression, we decided to lock mount command, so every player will have equal chance of getting Realm 1st Achievement.
Once all of them are taken, mount command will be available again.
Beside mount, there are few extra option, to spawn Auctioneer or Repair vendor, Trainer, bank or etc.
Note: None of these NPC wont provide help while in combat.
Also there is free portal to Dalaran with no cooldown (Can't be used in combat)