There’s two parts to this:
With regards notarisation, the developer news article you’re talking about indicates that the notarisation servers are running in errors-are-warnings mode. You should look at the log you get back from the servers to see if it has any warnings, and then fix those warnings. If you do that, you’ll be in good shape for any upcoming changes.
With regards Gatekeeper, the currently released 10.15 includes all the expected Gatekeeper checks. If your app passes Gatekeeper there, you should be fine.
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Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware
let myEmail = "eskimo" + "1" + "@apple.com"
Thank you very much for that clarification!