Warhammer concern

As I waited for a scenario to begin the other evening I got a furrowed brow. How in the world...aww I can't use my meme here...will Warhammer keep populations balanced? How are they going to manage to keep players on both sides so the larger side won't have horrific queues and the smaller side won't get zerged all the time? Warhammer touts itself as a PvP game. It is much more important to have a plan for how to handle this than it would be in WoW where battlegrounds were initially an afterthought and is a subset of the entire game.