Regarding the 11900K, it could be faster for gaming, or maybe just about the same speed. The 10900K already really trades blows with the top Ryzen 5000 CPUs. You can see this in the Hardware Unboxed review where they don't enforce the stock power limits
(unlike Gamers Nexus).
I'd be wary of cherry picked data from Intel. Depending on which games you pick, the 10900 can be shown to be significantly faster than the 5950X or significantly slower.
I'm a little skeptical of much improvement in gaming based on the Anandtech early review though. It could be that the current BIOS is ****, but considering we're only a couple weeks out from launch it seems to be getting late to push out a new BIOS if they want reviewers to use it.