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Apparently the people at CERN & FermiLab have rolled their sleeves, too, as there is already an alpha iso available for download:
ftp://ftp.scientificlinux.org/linux/scientific/6rolling/iso/
For those who don't know, ScientificLinux is Centos' less popular brother (born from the same mother - RedHat), built by and for the people at CERN and FermiLab.
Exciting times!