In case you didn’t see the announcement, RHEL 7 beta is available. I’ve been running RHEL 7 in several virtual machines for a while, and it works great for me.
The DVD image is ftp.redhat.com/pub/redhat/rhel/beta/7/x86_64/iso/rhel-everything-7.0-beta-1-x86_64-dvd.iso but it’s probably better to use the following virt-install command:
virt-install -n rhel7betax64 -r 4096 \ --cpu=host --vcpus=4 \ --os-type=linux --os-variant=fedora19 \ --disk path=/dev/vg_data/rhel7betax64 \ -l ftp://ftp.redhat.com/pub/redhat/rhel/beta/7/x86_64/os/