[CentOS] Centos 5.4 'prerelease-access' - is there such a thing?

Hi,

excluding the Frankengrade from CENTOS5.3 to upstream RHEL5.4, is there are procedure / repository access / nightly builds / ... to what will be CENTOS 5.4?

URLs? Howtos? Discussion threads or notes?

I checked help, wiki and forums and google, but came up empty.

Of course, this kind of use is depending on the way the new upstream RHEL sources are processed, so maybe there won't be a complete set of packages at all until maybe one or two weeks before the release. But again I got no lucky search hits for this kind of internals either.

I'll gladly collect and summarize for a (hopefully easier locatable) wiki-page to be :).

cu, Peter