At the recently concluded XDC 2018 conference, Intel's Linux graphics kernel developer, Manasi Navare touched upon the support for DisplayPort 1.4a and Display Stream Compression capabilities of the upcoming generation of Intel integrated graphics. The Gen 11 iGPU is slated to be a part of the 10nm 'Ice Lake' CPU family expected to launch sometime in holiday 2019.
https://www.notebookcheck.net/Intel-Ice-Lake-Gen-11-iGPU-will-support-DisplayPort-1-4a-and-Display-Stream-Compression-for-5K-120Hz.336622.0.html