Good news! In the next build of the PTR, we'll have our blessing of not having to shout out for invites anymore! With this, the auto balancing queues, and ability to queue and de-queue on the fly will make for a much simpler setup for Wintergrasp. Will it be enough to save the battleground's popularity with the newcomer in 3.2, however? Only time will tell.
You can check out the exact posting and news as it develops here!