Whens big team battle?

Just wondering how soon until big team battle is out? Its always been my favourite mode in halo, warzone is alright but it requires teamwork and unless you are playing with people you know its almost impossible to do good, capturing bases and killing AI cant be done by yourself most of the time so it gets annoying. I just want good old BTB back with mid sized maps since i dont like arena and its maps too much…

Late December, so around Christmas time.

Same with Forge.