We’ve got our Windows ARM64 buildbot back, thanks to @zware for looking after it. So the plan to make it the default continues as intended.
(Bearing in mind that the change for that is now in the Python install manager, and so will happen in time for 3.15, rather than as part of 3.15. People who want it to be their default now can already set PYTHON_MANAGER_DEFAULT_PLATFORM=-arm64 or "default_platform": "-arm64" in their configuration file).