Caporegime
So Zen 3 is out in H2 2020 apparently:
https://twitter.com/witeken/status/1054048735733448704?s=19
Zen 2 is meant to be on TSMC 7NM HPC.
https://twitter.com/witeken/status/1054048735733448704?s=19
TSMC says to expect meaningful revenue on 7nm+ "not the first half of 2020". This suggests that AMD Zen 3 is scheduled to launch in H2'20 (and go up against Tiger Lake on 10nm++).
Zen 2 is meant to be on TSMC 7NM HPC.