For advanced users who are not a part of testing team.
Qubes repositories (NOT the templates) for Fedora 42 testing were created and packages are built & uploaded around two weeks ago (only for r4.3 at this point). This is very early stage of the tests performed on the new release. Those non-testing team members (like myself) who want to have some fun and have 0) r4.3 installed 1) enough spare time 2) enough bandwidth/data cap 3) storage space for cloning Fedora 41 templates 4) patience 5) some technical knowledge; Might want to give it a test. This guide should be sufficient at this point.
I have already upgraded clones of Fedora 41 (minimal & xfce) templates to Fedora 42 without major issues. Things might still break at this stage. This issue on Github tracks possible problems:
Fedora 42 is good. It is hard to explain. But I mean noticeably good. Maybe it is the underlying GCC 15, LLVM 19 and Golang 1.24 compilers optimizations which made everything noticeably faster. Or maybe I am deluded.
Fedora 42 official release date is 2025-04-22 and Fedora 40 EOL date 2025-05-28
For those who are still on Fedora 40 and have not upgraded to Fedora 41, Maybe if Qubes OS project manages to release stable Fedora 42 templates before 40 EOL, it would be justifiable to skip upgrading to Fedora 41 and upgrade directly to Fedora 42.