Redditor _rogame spotted GPU configurations for the entire Renoir APU lineup in a data dump of AMD's Bootcamp driver. The leak indicates that Renoir will feature Vega graphics. CPU performance, however, will see a big boost thanks to Zen 2.
https://www.notebookcheck.net/Redditor-finds-GPU-configuration-for-28-Renoir-SKUs-in-AMD-s-Bootcamp-driver.447895.0.html