AMD chief Dr. Lisa Su delivered a keynote at the Hot Chips conference earlier this week and spoke about the company's plans for HPC and exascale computing. Dr. Su also reiterated that CrossFire multi-GPU support is no longer a focus and that more information about Threadripper 3000 will be available later this year.
https://www.notebookcheck.net/AMD-confirms-CrossFire-is-no-longer-a-focus-next-gen-Threadripper-to-be-revealed-soon.431301.0.html