Hi all,
libvirt-1.0.2 in rawhide and virt-preview has busted python bindings, which breaks virt-manager/virt-install. Upstream mailing list posting:
https://www.redhat.com/archives/libvir-list/2013-February/msg00053.html
'yum downgrade libvirt*' fixes things for me, I'll look into a proper fix tomorrow.
- Cole