Pins of War posted up links to all of the updated FAQs for the 40k codices.
Go see how the rulebooks have changed.
From the post:
Games Workshop’s Black Library website updated all the FAQs for Warhammer 40K in light of 7th Edition.
There is a complete download (zip file), as well as individual FAQs for the different Codex books.
I am still a bit confused as to why Black Library is the shepard of FAQs these days, but at least there are here. From a first look, they seem very thorough (or at least, very detailed, especially in the case of older books such as Dark Eldar).