core-agent-linux/misc/qubes-r2-beta3.repo

[qubes-vm-r2b3-current]
name = Qubes OS Repository for VM (updates)
baseurl = http://yum.qubes-os.org/r2-beta3/current/vm/fc$releasever
gpgkey = file:///etc/pki/rpm-gpg/RPM-GPG-KEY-qubes-2-primary
gpgcheck = 1

[qubes-vm-r2b3-current-testing]
name = Qubes OS Repository for VM (updates-testing)
baseurl = http://yum.qubes-os.org/r2-beta3/current-testing/vm/fc$releasever
gpgkey = file:///etc/pki/rpm-gpg/RPM-GPG-KEY-qubes-2-primary
gpgcheck = 1
enabled=0

[qubes-vm-r2b3-unstable]
name = Qubes OS Repository for VM (unstable)
baseurl = http://yum.qubes-os.org/r2-beta3/unstable/vm/fc$releasever
gpgkey = file:///etc/pki/rpm-gpg/RPM-GPG-KEY-qubes-2-unstable
gpgcheck = 1
enabled=0