Hints about SUSE's 'Adaptable Linux Platform' emerge
Compilers have supported these levels since GCC11 and LLVM Clang 12. Over in Red Hat territory, distros since Fedora 32 in 2020 and RHEL 9 this year have targeted and required x86-64-v2. So far, we haven't heard anyone complaining too much about it – but requiring x86-64-v3 is another matter.
Although SUSE is not yet confirming anything, recent announcements from the openSUSE project are giving some ideas of how this future family of distributions might look. The openSUSE project is asking users to try out the MicroOS Desktop distro "to gain user perspectives on its applicability." The distro offers both GNOME and KDE flavors, and is still somewhere between alpha and beta testing stage depending on which desktop you choose.
The openSUSE community also has a working group discussing the impact of these technologies. Interestingly, one of the early reactions we've read is strongly positive.