Its here.... FAQs, Erratas, and any adjustments to the rules that you will need to know about.
via the Warhammer Community
https://www.warhammer-community.com/2019/04/29/warhammer-40000-update-april-2019-gw-homepage-post-2/
So, what does this update contain? Well, the first thing we have done is to update our FAQ and Errata documents to take into account any new questions that have been raised since their last update (so if you have a question about a specific army, make sure you check out the Errata and FAQ document for that army’s codex). These updates include some changes to the core Warhammer 40,000 rules and some further clarifications of how certain rules work – the most notable changes and clarifications are the first things detailed in the Designer’s Commentary (see below).
Next, we have looked at all the beta rules introduced in the last update and, after making some changes to incorporate your feedback, have finalised those rules. Finally, we have made a handful of changes to certain rules to help address some balance issues that are consistently being raised by the community. These can be found at the end of the document.
We hope this update clears up any questions you might have about the rules, but please continue to send your feedback to 40kFAQ@gwplc.com. In the meantime, may you always roll sixes (unless you’re taking a Morale test).
Thanks, Robin! The Warhammer 40,000 Update – April 2019, complete with notes and insights from our designers, is now live – download it in your preferred language via the links below. It’s also available over on the Downloads page along with a number of updates to codexes and rules supplements, including Shadowspear and Vigilus Ablaze.
Let us know what you think on the Warhammer 40,000 Facebook page!