Those pkgs were published a few days back, make sure you are looking at the c5-testing repo.
w.r.t mysql, am working on something even more fun. look for into on that in a day or so :D
i am looking at the x86_64 area: http://dev.centos.org/centos/5/testing/x86_64/RPMS/
and i don't see any httpd in there.
as for the mysql stuff, i'll repeat my suggestion of keeping the rhwas separate from other, even newer versions of mysql. what i want to do is replicate a rhwas environment. for testing, it is fine to mix things all together, but i still think a webstack repo or the like will be the best long term solution.