well, shit. There was a bit of miscommunication, and backzone is not supposed to be in this patch. There's some things left unfinished and placeholder dev grid brushwork laying about where models need to be. Backzone will make it into 3.1 if I can get to it tomorrow and finish up everything, but I don't know. Don't get your hopes up.
If it doesn't make it, it will be in the next patch/update for sure.