With OpenMandriva Lx 4 now in beta it seems that RPM5 lost all its main users. CAOS, Ark and Unity are discontinued, Wind River and OpenMandriva switched to RPMv4

Interestingly, it’s also the end of urpmi with both Mageia and OpenMandriva switching to dnf.

It seems rpm world entered a semi-unified state with dnf and zypper, both libsolv based and partly interoperable