Mercenery Mode?

[Wylderson]

So if one were to roll ally solely to get faster bg queues will that no be a thing if mercenary mode is active since a fraction of allys will be converted to horde (if I understand the system correctly).

[lkajsdkf]

The faction with more PvP player queued has longer queues - need to wait for others to get in before you. Mercenary mode works like this (afaik);
If there are 11 ally and 9 horde queued for WSG, one ally will be converted to horde so they are 10v10. It also works the other way around with the factions (horde outnumbering).