That is a pretty good performance improvement. Hopefully they will officially announce this soon so we can see some comparison benchmarks against Intel cpus.
The one good thing about this being Zen 2 instead of Zen 3 is those people that bought X370 boards will now have another CPU option to choose from if they don't want to do a full upgrade.
PC Specs: CPU: 7800X3D || GPU: Strix 4090 || RAM: 32GB DDR5 6000 || Main SSD: WD 2TB SN850