RHEL 7 is officially out and available for RHEL subscribers. You can get more information about the release from http://developerblog.redhat.com/2014/06/10/red-hat-enterprise-linux-7-now-generally-available/ or via the press release at http://www.redhat.com/about/news/press-archive/2014/6/red-hat-unveils-rhel-7 Congrats to the RH team for all their hard work in making this happen.
As for CentOS 7, it's currently working its way through our build process. As we have updates you'll be able to follow them here at seven.centos.org. We'll post updates as regularly as we can to help keep everyone current on the progress.