The Tau Empire is coming to Battlefield Gothic: Armada as a beta meaning that the Tau fleet will be free to those who pre-ordered the game or bought it within the first two months it was out. The beta itself, however, will be free and open to all.
The Tau have advanced technology and huge damage as well as being extremely dedicated to the Greater Good philosophy. The instructions on accessing the beta are on Steam, so all who want to see the Tau in action should go there and try them out.
The beta starts today and although a full launch date hasn't been announced Tindalos Interactive have said it will be out before September ends.