AMD Confirms "Big Navi" GPU Coming In 2020
AMD has published a video interview with AMDs CEO Lisa Su at CES 2020 on their YouTube channel where Dr. Su confirms that AMD will be bringing a "Big Navi" GPU product to market in 2020. She did not provide any details what so ever beyond that. The only thing we can say for sure is that it will have more than the 40 compute units the currently biggest RX 5700 XT Navi GPU has.
AMDs CEO Lisa Su said this in an appearance on AMDs infomercial / product promotion show "The Bring Up" which was posted on AMDs YouTube channel on January 17th, 2020:
"People are wondering about "Big Navi" and I can say you are going to see "Big Navi" in 2020."
Lisa Su did not elaborate on what a "Big Navi" product would entail or when it will launch. AMD announced 8 core laptop APUs and CPUs, a 64 core threadripper CPU part and some mobile GPUs at CES 2020. They also launched a low-end RX 5600 XT GPU part for the market segment between the very low-end RX 5500 and the mid-range RX 5700 GPU products. AMD did not mention any "Big Navi" product in their CES keynote. They would have mentioned it if they had something like that ready to launch in the near future.
My close-up inspection of the latest amdgpu changes in kernel graphics driver development tree does not indicate that AMD is working on driver support for a "Big Navi" GPU or any other not already launched desktop GPU part. AMD tends to add PCI IDs and things like that to the amdgpu graphics driver three months before a new product comes to market.
It is safe to assume that we won't see any "Big Navi" product until Q3 or, more likely, Q4 2020. Your guess is as good as ours when it comes to specifications, pricing and the actual launch date.