July 7 will see the launch of AMD's 7 nm parts including the Ryzen 3000 CPUs and Navi GPUs alongside the new X570 chipset. A detailed announcement is expected during Computex 2019 in June followed by wide availability in July. AMD is also expected to announce 12 and 16-core Ryzen CPUs in the July to September timeframe. While Zen 2 is mostly on track, the simultaneous launch of Navi depends on whether TSMC is able to cater to the demand.
https://www.notebookcheck.net/AMD-Ryzen-7-nm-round-up-Ryzen-3000-X570-and-Navi-being-reported-targeted-for-July-7-12-core-and-16-core-CPUs-expected.409691.0.html