Since that night, it is possible to download the public beta of macOS Catalina on your Mac, and to download tvOS 13 on your Apple TV.
Good news for Mac and Apple TV owners: Apple has released the second public btas for macOS Catalina and tvOS 13.
The final version of macOS Catalina is not expected until next fall. The public beta therefore allows those who wish to test the novelties in preview. Be careful, however, according to the first feedback, the OS is not quite stable and the bugs are still numerous. It is better to avoid taking risks if you only have one Mac that also serves as your workstation.
Regarding tvOS 13 on the other hand, the returns are rather good and the risks minimal, according to the first testers.
Those wishing to test these two btas can register for the bta-testing program via this link. The procedure is rather simple and well explained on the site of the apple.