I think architecturally the chips are going to be more similar to Zen 2, than Zen 2 was to Zen+. As a result, it may be the case that AMD hasn't released to motherboard vendors because they don't expect major issues; or alternatively, what I think is the case, is that AMD have told mobo vendors, et al, to lock things down and stop benchmarking ES and pre-release CPUs on benchmarks with public databases.From what has been told/alluded to/hinted at, AMD intends to release Ryzen 4000 CPUs in Q3/Q4 2020 however we haven't had a single leak so far. It's kinda unusual — looks like motherboard vendors haven't received any samples yet.
Any ideas why? Are they postponing the release or just not rushing the things in order to sell the stock? Even now we still have tons of unsold 1st/2nd gen Ryzen CPUs.