So, I just got back from a 500 mile drive(to get home). I started at 6 am when this all started. So, Aside from the fact that you now have to give $640 for a 3900x, and I won't pay that, below is my take on the reviews and comments.
First, bios appears too beta, performance and power should get better when bios is not beta.
Second, no mention of what PCIE4 really brings that an X470 can't provide.
Third, single core performance sometimes beats, and sometimes looses to 9900k
Multi-threaded 3900x is the new king in power and efficiency.
Gaming is now so close it's not a compelling reason to get a 9900k, especially given point 1 which could still make a big difference.
And last, overall. given that the 3900x comes with a decent heatsink and is the same price, but more efficient than a 9900k and is a clear winner in everything but games, its clear the desktop choice for $500.
Oh, and I also think IEC was clear and correct on all his points above.
Now if I can just buy one for list.......