It's a pretty wide launch window alright, but here's the story. A Chinese website called Uniko's Hardware obtained and publsiehd a slide indicating that Intel would be planning to launch its upcoming Core 10000 processors for desktops between April and June. 

That's an interesting slide you can see below. Historically Intel always releases a handful of processors in e.g. 2x Core i5 and 1x Core i7 and then later on the rest of the procs. Also, you could see K model processors being released fist followed by KF (non-IGP) etc. We've stated and indicated April for a launch many times already ourselves, however, everything is a bit hard to plan with the Coronavirus active on a global scale. That might delay launches. The slide indicates media activity embargo wise after April 13th up-to June 26th 2020.

Intel to launch 10th generation Core processors between April and June