Here comes the very first image of the new Sony a7R4a (Source: Weibo ).
The only difference I can find is the missing Sony logo under the LCD screen. And yes, the screen looks better as it uses a new higher resolution version.

Nokishita reports that the Sony A7rIIIa and A7rIVa camera preorders will open on Monday May 17.
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Reminder: What’s new on the A7rIVa and A7rIIIa?

1. LCD resolution has changed from 1.44 million dots to 2,359,296 dots
2. They both support USB 3.2.
3. The Sony logo under LCD monitor has been removed
4. There are also small changes in their battery life

https://www.sony.com/electronics/interchangeable-lens-cameras/ilce-7rm3a

https://www.sony.com/electronics/interchangeable-lens-cameras/ilce-7rm4a

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Thanks Elliot!