Tau are coming in the next Psychic Awakening book and now we have this. Looks like this all matches up.
This seems rather logical so I am inclined to believe it's true. Still.... grains of salt. Big Reveals coming here shortly from GW in Las Vegas.
via Sprues and Brews
https://spruesandbrews.com/2020/01/22/aeronautica-imperialis-the-taros-campaign-tau-coming-soon/
A little Kroot-hawk has shared a whisper that the next Aeronautica Imperialis supplement will be featuring the T’au and tell the tale of the Taros Campaign.