It is looking now like an upgrade is going to be fairly easy ... but will require you to remove at least one package (linuxwacom-devel) by hand. This package was removed upstream.
Also take care of at least one group of packages manually (Image-Magick*) as they were labeled as .fc6 in the Beta and are .el5 in the release (aslo done upstream).
Does this mean that effective the existing Centos 5 Beta (4.92) will be the same as the final Centos 5 release? i.e. whatever works in beta will be working in 5 and whatever isn't will still not be working?