Have you kids seen the new 40k galaxy map from the upcoming 8th edition of 40k? (image too large to display on the forum directly hence the link)
http://pro.bols.netdna-cdn.com/wp-content/uploads/2017/04/galaxy-shadowbox.jpgIt looks like chaos is ascendant and spreading after the destruction of the planet Cadia (and all the ancient pylon structures on it that previously held the eye and chaos effects in check for millions of years). We haven't heard about it yet in the background but there looks to be a new giant warpstorm at the heart of the galaxy - much bigger than the Eye - with tendrils either side, which effectively split the Imperium in two halves. After reading the recent trilogy of army book supplements I feel quality of the new background is ok but not great, but I'll be interested to see where the story develops with the returning Primarchs, the new Eldar god of death, ect.