"...we're also hard at work on our team-balancing feature for the battlegrounds. This feature won't be ready for this next content patch, but will be added in a patch sometime after the expansion launches."
We had planned and worked to have the feature ready by expansion but unfortunately development time was tight and it was (painfully) decided that it would have to be put off in favor of devoting additional resources to other features. We're currently planning for a post-expansion patch including the team balancing feature. up the airy mountain and down the rushy glen
we dare not go a-hunting, for fear of little men