Python 3.15.0 release candidate 2 freezes the ABI ahead of the 2026-10-01 final

Sources: primary, discussion
Summary: Python 3.15.0rc2 was released on 2026-09-01 as the final release candidate of the 3.15 series. The announcement sets the final release for 2026-10-01 and states there are no ABI changes from this point.
Why it matters: There are no ABI changes from this point in the 3.15 series, so maintainers can build and publish 3.15 wheels now and any wheel built against a release candidate keeps working.
Follow-up: Confirm the 3.15.0 final ships on 2026-10-01.