Turns out that the recent XFastest leak about the 9th generation Intel 'Coffee Lake-S Refresh' was a bit outdated. New slides have emerged that confirm the 9th gen CPU launch in Q3 2018 itself. Adding credence to this is another roadmap via HKEPC that confirms an October 2018 launch window. This will also be the time when the Basin Falls Refresh is expected to launch.
https://www.notebookcheck.net/Fresh-leaks-confirm-Intel-Core-i9-9900K-Core-i7-9700K-Core-i5-9600K-and-Core-i5-9400-launch-in-October-2018.320204.0.html