Also in there but not listed is that the Farsight Enclave can be used as a battlebrother ally to the Tau codex, and vise versa. There are several items and wargear that are very good, but also very expensive point cost wise. I have read over these several times now, and while very nice and flexible, I do not have an opinion of how useful they will be yet. A Tau codex supplement, Farsight Enclave is now available digitally, and even though the hardcover version is not going to be available until October, the rules have been all over the web now for the last 24 hours.
