Should we expect in the foreseeable future a Bitcoin Core release optimised for ARM-based Macs?
Of course. QT, the GUI framework Bitcoin Core uses, is one of the most portable GUI frameworks. Sooner or later, Apple Silicon support will be added. Meanwhile you can track the progress here: https://bugreports.qt.io/browse/QTBUG-85279
Then Core developers will do the rest: https://github.com/bitcoin/bitcoin/issues/20371
It was discussed at an anonymized Sydney Socratic Seminar in July. I'm assuming MacOS will continue to be supported but it is becoming harder "to build and distribute binaries in the completely reproducible, trustless manner" that Bitcoin Core would like to.
Apple is introducing these notarization requirements where we would have to build our binary and then send it to Apple servers so they could notarize it. Then they would send it back to us and that’s the only way we could distribute a binary out to end users that would run on their Macs. Obviously doing that sort of stuff is tricky for us especially if it requires more official things like having an organization. I guess we already do that in some part because we have code signing certificates but I think the direction that Apple is going is making it harder and harder for us to continue or want to continue releasing Mac OS binaries. I know some of the developers are getting less enthused about having to deal with all of Apple’s changes and distribution requirements.