Even though Intel warned that the 14 nm CPU shortage could continue until the end of the first half of 2019, the company appears to be ready to launch a new stepping for the gen 9 Core processors in just a few weeks. This information is confirmed by ASUS and Gigabyte, which already updated their BIOS for the 300-series motherboards. Gigabyte even leaked the full list of R0 CPUs.
https://www.notebookcheck.net/List-of-new-Intel-gen-9-Core-CPUs-with-R0-stepping-leaked-by-Gigabyte.415175.0.html