Jonas mentioned that he'll chime in here shortly. There is still an issue with the configuration that he's working on. (Apparently there is no backup for Team Drives yet, so if the system fails.... POOF!)
But I'll let him elaborate. I think it's safe to say that it's coming soon to a District near you, but an exact date isn't set yet.
EDIT: So ... my cool Yeti post got 1 like but Eve's cute puppy post got 2 likes.