Games Workshop has posted up the .pdf changes to all the codices for 40k. They’re all now up to 6th edition specs.
From the website:
Below you will find all the latest FAQs and Errata pages for Warhammer 40,000 and your favourite Warhammer 40,000 armies. Next to the name, you’ll see a date and a version number that will tell you when the FAQ was put on the web site. This way you’ll be able to tell which FAQs have been added or changed since your last visit.