J Leslie Turriff composed on 2022-09-02 16:37 (UTC-0500):
It looks like OpenSuSE has decided to deprecate Leap, their long-term stable release, possibly in favour of Tumbleweed, their rolling release (they're being very coy about what will replace Leap).
Prior to Leap, openSUSE simply used version numbers, and Factory was equivalent to what we now know as Tumbleweed. It's my expectation that Leap expiration will amount to little more than another name change, as when Leap was added to the version number after 13.2 release, "leaping" over v14.x to 15.0. In any event, 15.5 /will/ follow 15.4, and remain supported until the end of 2024 at least.