Ok, its not much of an update, simply an errata on a couple things that slipped through the to the final printing. It is a good a sign though, that GW is on it, when it comes to looking at what they just printed and published to the greater community. (the greater community part was my dry humor pun with the Greater Good, sorry).
So here is the link
and if you really do not want to follow that, here is the complete update listed below. Its not much.
Page 32 - Warlord Traits
Replace the introductory paragraph with:
When generating Warlord Traits, a Tau Warlord may eitherroll
on one of the Warlord Traits tables in the Warhammer 40,000
rulebook, orroll on the table presented on the right.
Page 95 - Drones list
Add the following note to Missile Drones
* May only be taken by models equipped with Broadside
battlesuits.
