Packages for the el7 beta are starting to show up in the EPEL repository. If you've been holding off looking at the beta because there were some 'required' packages missing, you might want to see what's available now.
http://dl.fedoraproject.org/pub/epel/beta/7/x86_64/repoview/
EPEL's repo for el 7beta can now be installed by:
yum install http://dl.fedoraproject.org/pub/epel/beta/7/x86_64/epel-release-7-0.1.noarch.rpm
Are these packages for RHEL 7 rc also?
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