Your comment made me rewatch that section of the Keynote [1], and I believe you're right. Docker and Parallels were shown in a 'virtualization' subsection, and not the Rosetta subsection. So that must have been ARM64 Debian we saw there indeed. Did I say that their presentation was too fast :) ?

That's going to be interesting in the end. Being able to build/smoke test x86 containers on macOS will be important, at least for a while. So it's up in the air whether that will be addressed, although it's worth noting that Docker already supports cross building images [2].

[1]: https://www.youtube.com/watch?v=GEZhD3J89ZE&t=5918

[2]: https://docs.docker.com/buildx/working-with-buildx/

Another interesting note is that the user agent in their Apache logs still says "Intel Mac OS X". Wonder if they'll keep that.