Cent right now is a bit slow in development
red hat released RHEL 5.6 then RHEL 6.0
centOS is at 5.5 and when 5.6 will be out ??? who knows a guess is 3 to 6 months ?
THEN and only then will work on centOS6 start
you might want to look into Scientific Linux 6
it is supported by the USA's FermiLab and CERN