After Sony released the new a7 IV(B&H/Adorama/Amazon), next full frame mirrorless cameras from Sony could be the Sony a7R V and Sony a9 III. Both cameras are expected to be released in late 2022.
From Weibo:
[Still 24 million! Sony A9 III may be released in the fourth quarter] There are new rumors, the new Sony A9 III is expected to be officially released in the fourth quarter of this year, the new phone still uses a 24 million pixel sensor, with a new menu, equipped with a tiltable angle screen, support The 4K video shooting at 60 frames per second is expected to cost $4,999, or about RMB 32,000. At the same time, there is very little information about the A7R V, but it is expected that the new machine should be released in the fourth quarter of this year.