Apple has teamed with Black Magic Design on a new eGPU enclosure to accompany its new MacBook Pro line. The enclosure is fitted with an AMD Radeon Pro 580 desktop GPU with 8GB of GDDR5 RAM and also acts as a Thunderbolt 3 dock.
https://www.notebookcheck.net/Apple-teams-with-Black-Magic-Design-on-eGPU-for-new-MacBook-Pros.315928.0.html