World PvP will barely be a thing on launch. Almost all Onyxia players will just be rushing to level 80. Spawn rates drastically increased and x3 exp so players will move through it quick.
Blackrock won't be launched until after Onyxia establishes itself at level 80 just like on TBC. Onyxia will get a head start. You have all the time in the world right now to farm endless amounts of gold to just buy everything instantly or you can just buy it off trade. 1k gold is only 5 coins last I checked. If you think you're at a disadvantage then you're blind.

