Apple has just released GM seed for developers, that is, the version Golden master of macOS Catalina 10.15 (compilation 19A582a).
If no significant bugs are found in this build, it will most likely be exactly released for all users soon.
Officially, Apple has promised to release macOS Catalina for the month of October (broadly). There were indications that this could happen on the 4th, but with GM leaving today and considering that tomorrow a Friday (typical day for releases like this), it is likely that this date will be bored you will know, no.
MacOS Catalina is the last major operating system to be released this year after iOS 13, iPadOS 13, watchOS 6 and tvOS 13. The promised HomePod update is still missing, but it obviously doesn't have the same importance. from others.
To those already running it, what are you thinking?
Update 10/04/2019 19:25
For those already running the latest macOS Catalina builds, Apple recently gave Apple Arcade access to its game subscription service that is already active on iOS / iPadOS 13 and tvOS 13.
Anyone who wants to enjoy Apple Arcade s needs to open the Mac App Store in Catalina.