Looks like they are sitting on the 16C part for now, which is a bit of a shame, but they must feel confident that they have, for now, got Intel covered. It's nice to see that AMD are confident enough to play it this way and not show their hand all at once, I don't think they will have a 5GZ part, extrapolating from their known CPU's I guess it'll be something like 16Core/32T @ 4-4.2Base/4.7-4.8Boost @125-140W($600-$650) - it'll still be a beast.
They did say they haven't abandoned TR4, but no concrete details as of yet.
14nmFF++++++++ is already a volcano at 8 cores, on such a small package, and they need to hit massive clocks to be competitive with Zen 2.
10nm by Intel's own admission has now had EUV canned completely, clocks are much lower than the bigger node, and yields are a disaster (rumoured to be no better than 30%). Hence why we've only seen a trickle of mobile products on it so far. They claim they're going to do their first GPU, and low power sever / workstation chips on it next year, but we'll see about that ...
So basically, any major improvement has to be in 2021, Intel hopes, on their 7nm EUV .. and that's still scheduled to be Core architecture.
Why launch the 16 core part at all on AM4? Do it with Zen 3 and 7nm EUV or 6nm EUV. It's total overkill for gaming, and general productivity, and for other purposes, that many fast cores are likely going to be a bit starved on dual channel. Keep it for TR4.