I suspect that once Ampere reviews drop we'll start seeing some AMD leaks come out. Sure they could drip something out ahead of NVidia's launch, but if they have actual hardware to run they can figure out the best games or benchmarks for their own cards and let those leak out.
Depending on the exact launch dates we'll eventually get leaks anyway, just as we saw with Ampere, but the first ones are more likely to be controlled and if you're going to do controlled leaks then it's best to have as much solid information as possible.
I would imagine Sony also prices at $500. I can't see them doing $400 and anything in between feels both odd and like an admission that they have an inferior product. I also wouldn't put too much stock into how that affects AMD's pricing either though. Both MS and Sony get a cut of every game sold and can sell their hardware at cost or even a small loss. AMD doesn't have that option.
Recent history suggests AMD will move to match NVidia's price points while offering a slight advantage in terms of raw performance per dollar even if it isn't a significant one. If they have a 3080 competitor don't expect it to cost less than $600 and if it has even a 5% lead over the 3080 it's going to be at least $700.
We might even end up with a weird stratified match up where AMD targets the $400, $600, and $800 price points where NVidia doesn't have any products.
Who knows what rumors concerning crypto mining efficiency of new cards could do. Mining could certainly flare up like a bad case of herpes and throw everything out the window.