The LRL book will leak on September 30th at 6:57 pm CST, the day before it goes on Preorder.
It will be accompanied by the Tzeentch book, and a hoaxed destruction battletome two days later, featuring rules for a Gargants and Gitz faction merger that will be disproven within the hour by a press release from GW officially updating the roadmap to show the actual destruction tomes, and an unspecified tome that s2d will be paired with in winter.
so says Sahrial, who looks into time, and speaks the visions of What Will Be