With RedHat about to release Enterprise Linux 6.5, the Centos team have started building Centos 6.5 today (see this forum post). Judging by recent Centos releases, we’ll be likely to see them releasing 6.5 in a few days or so. As soon as they do we’ll be grabbing the ISOs and adding them to our libraries so that customers can upgrade or install using an ISO.
By the way, if you have a RedHat Enterprise Linux subscription, you can install it onto a VPS if you provide us with the ISOs. Please raise a ticket if you would like to do so.