Which faction has a shorter queues for BGs (both, random and rated ones): Horde or Alliance?
I play Alliance and usualy i have very long queues compared to MoP. If Horde has much shorter queues, i will transfer my chars to Horde ...
Right now it seems Horde does cause many pvp-ers have rerolled Alliance.
Still, this is all very speculative.
Also, with Trashran as free honor/conquest farming grounds (provided you found a group in the group finder, that owns events) the nr. of players doing bgs for gear has dropped a lot.