I don't get it. Reading this line from the FAQ
"No, CentOS releases will follow shortly after the release of Red Hat Enterprise Linux source. "
leads me to believe that CentOS will be largely usable as it has been, as a free, completely compatible version of RHEL. Yes, with challenges in errata availability, but that's the use case.
Suggesting that CentOS is going to be *upstream* of RHEL suggests several other valuable, but completely different, uses. I'm not sure this is a great move, as I see bigger challenges coming from the free and polished desktop side (*cough* Ubuntu).
RHEL 7 should be very interesting.