Books affected were:
40k rulebook, Apocalypse, Blood Angels, Chaos Daemons, Chaos Space Marines, Dark Angels, Dark Eldar, Eldar, Grey Knights, Imperial Guard, Necron, Ork, Space Marine, And Tyranid.
Book not updated: Black Templar, Tau.
Does this mean that we may be seeing updated codices for Tau and Black Templar sooner than later?
Here is the link if you would like to check the changes out.
Warhammer 40k FAQs