Leaked accidentally as a part of an Intel Spectre/Meltdown Microcode mitigation PDF and removed later, but not before the data was already seen by some sites, including Wikichip, the data shows that these are pretty much the same as the 8th generation 8000-series SKUs with a minor frequency bump.
Unfortunately, the leak does not reveal which CPUs come with enabled HyperThreading, but these should be the same as on the already available 8000-series chips. The list includes three Core i3 quad-core CPUs and a total of five Core i5 six-core chips, which suggest that Intel could also release eight-core Core i7 SKUs in near future.
The most interesting ones are the Core i5-9600K and the Core i5-9600, which got a 100MHz base and 200MHz frequency bump compared to the Core i5-8600K and the Core i5-8600 SKUs. There is also the Core i3-9100 SKU, a quad-core chip working at 3.7GHz base clock and no support for Turbo.
Unfortunately, it appears that Intel's 9th generation desktop SKUs won't be that interesting.