Blizzard figured it out, will SE? Please...

http://www.ign.com/articles/2015/07/...paign=Blogroll

An upcoming patch will add a player versus player Mercenary Mode to World of Warcraft.

This means that if your faction is experiencing a long wait time to get into Ashran or unrated Battlegrounds, agents will appear in your base that will allow you to enter disguised as an enemy player, playing for the other faction.

You still earn all the same rewards when playing as a mercenary, unless they are faction-specific achievements. Your race will be automatically changed into an appropriate one from the opposite faction while you're inside Ashran or the Battleground.

The announcement on the WoW blog says that Blizzard's goal "with Mercenary Mode is to allow players who want to participate in Ashran or unrated Battlegrounds the ability to do so without having to wait through long queues, while still maintaining the spirit of the core Alliance vs Horde fantasy."