When PowerColor released the RX Vega 56 Red Dragon earlier this year, there was talk that a true ITX sized version might be on the way due to the miniature PCB underneath the full-sized cooler. They have now confirmed that a 'Nano' design will be showcased during Computex 2018.
https://www.notebookcheck.net/The-ITX-sized-RX-Vega-56-Nano-is-real-and-it-arrives-next-month-says-PowerColor.303824.0.html