I don't know if it's simply a case of all the Allies on my server suddenly decide to do the new quests, having all simply max-capped honor or some update I missed, but for the past week we've been having completely even WGs and often times Horde apparently outnumbering the Allies as I've actually had queuing problems getting in.
Can't complain though - Horde held WG the entire weekend, both O and D, which made farming my goblin trike on my engineer a dream as the toon was raking in the WG bonus non-stop.