A couple weeks ago we had a rumor set that many different units that we may see in a future Tau codex. One in particular was a Beastly Transport. This morning we have a little bit more info on this transport.
I have included the previous rumor regarding the transport for those that do not remember it well. (like myself)
previous rumor via stickmonkey
My sources are telling me kroot are in fact still part of Tau, and have a new unit or two including a beastly transport. They may have more options in a later supplement.
via Stickmonkey on Warseer
"Beastly Transport" ---> Unit Type="chariot"...Size=Flying oval