I would wager to say it won't make much difference for Corona because it's mainly improvement in bandwidth, not latency, unless you buy really expensive high clocked kit. We've already seen that even 8-channels of ThreadripperPro (which is 4 times the bandwidth of Ryzen therefore) makes absolutely zero difference, it's only the total latency that matters.
And even 7200 MT/s CL36 is not really improvement to 3600 MT/s CL18 in terms of latency for example, it's pretty much the same. So how much it does in practice will show only in benchmarks. It does influence the Infinity Bridge between dies, but we've also seen how little that can improve with 39xx Ryzen & Threadrippers when it comes to rendering. My 3990X is faster at 2133 MT/s than 3600 MT/s because the memory controller in IO is less stressed :- ) And I've never found it to bottleneck anything else, majority of benchmarks testing latency & bandwidth focus on niche applications (like PC game Factorio, etc..,).
I would honestly not expect any miracles from that particular aspect, it's just one of those "nice to have" products that are brand new and feel future-proof. But future-proofing is failed concept best to ignore.
I would wait for reviews of 13900K and particularly compare how both these chips run when limited to similar power enveloper (like 150W). These chips are super hard to cool because they are very tiny, so it doesn't matter how overkill watercooling or anything else is used because it's just hard to transfer heat away from such small surface area.
7950X can consume up to 250W, and has 3 small dies. 3990X consumes up to 280W but has 8 medium sized dies. That's a huge difference, so these chips will always run at 90C and throttle over longer rendering period.
I would probably consider 10 minute loop of CB23 to be better performance indicator than current Corona Benchmark.