This isn't in the next release (7.5.4) but I'd guess it will be in the release after that (7.5.5) which will probably be with us in roughly 3-4 months.
librpm-4.3.so is needed by psa-7.5.4-rhel4.build75050803.19.i586
librpmdb-4.3.so is needed by psa-7.5.4-rhel4.build75050803.19.i586
librpmio-4.3.so is needed by psa-7.5.4-rhel4.build75050803.19.i586
librpm-4.3.so is needed by psa-pre-keyupdate-7.5.4-rhel4.build75050803.19.i586
librpmdb-4.3.so is needed by psa-pre-keyupdate-7.5.4-rhel4.build75050803.19.i586
librpmio-4.3.so is needed by psa-pre-keyupdate-7.5.4-rhel4.build75050803.19.i586
In the above thread I meant that Plesk is compatible with CentOS 4, as is is with RHEL4, but not on 64bit. Virtuozzo does not support any of them as they are on 2.6 kernel.