Tim,
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I had a look at http://buildlogs.centos.org/centos/7/os/x86_64-20140614/ but I could not find any qcow images for a VM guest.
Is it planned to produce one ?
Creating a cloud instance is our lowest effort way of testing new releases.
The easiest way to make your own would be to boot the network install boot.iso and create your own VM in your preferred virt platform. I used KVM and it worked fine. Once the install is done, customize as you see fit (like add an /etc/yum.repos.d/centos-alpha.repo for example). Shut the machine down and clone the disk image all you want.
Let me remind everyone that Fabian Arrotin built livecd-creator for CentOS 7 a while ago (see: http://seven.centos.org/2014/05/centos-7-live-media-spins/) and there are some preliminary kickstart configs for it (https://github.com/CentOS/sig-core-livemedia). I was able to build my own LiveDVD with KDE, Firefox, LibreOffice, GIMP, and inkscape yesterday and it is working great. Not related to cloud images but for anyone who wants to make Live media that also allows one to install, thumbs up.
TYL,