Slides of AMD's May 2019 Investor Presentation seem to suggest the third-gen Ryzen Threadripper is no longer a go. While roadmaps from two months ago still showed this chip, the new roadmap no longer shows a new Threadripper for 2019.
There are several explanations here, it could mean the Zen 2-based Threadripper got cancelled or got delayed to 2020. Alternatively, it could be that we're reading too much into this and that the chip is still slated for 2019.
Guess we'll learn more in the coming weeks and months.
AMD Investor Presentation May 2019
3rd Gen Ryzen : MID-YEAR 3rd Gen Ryzen TR : delete Zen 3 : On Track Zen 4 : In Design EPYC Rome : Expected Q3 2019 pic.twitter.com/0xF8Ghcn6P