We saw Apple's first demo of the new Mac operating system at WWDC in June 2019.
The new operating system will be available to download in the autumn - so probably September as usual, but it could be October.
However, you may not have to wait as long as that. If you are a
registered developer you can download the beta of Catalina now, and if
you sign up for the public beta you can get your hands on the Catalina
beta in July.
QWin Deluxe Subscription - sticking with R47.15 - Win10