thus Paul Stuffins spake:
Has RedHat even released RHEL6?
Nope. But it's all over town that Red Hat might conduct one or more public (!) beta tests of RHEL within the next several weeks (mind Red Hat Summit in June).
I didn't think they had, hence no CentOS6.
I have actually just been reading a thread about RHEL6 on LinuxQuestions.org and they are saying that it is looking like a release of RHEL6 will turn up at the end of this year as RH are hammering through bugs that have, apparently, been in Fedora since Fedora 7.