Well, thanks to my good buddy Ryan and his friends over at TG I have this piece of garbage. It may be a very well made fake or it could be genuine. If it is genuine, I will be able to mix and match any non-tyranid model I want with my Tau. Yes, indeed for some reason I can bring something from any book, but nids and my Tau will generally be okay with it. Apparently my Tau, who are historical enemies of the Orks are more likely to ally with them than sisters of battle. The sisters (formerly Witch Hunters) are now as likely to ally with the non-psychic alien Tau and the entirely psychic Eldar. There will be some very odd armies coming in about a week.