virt-manager first run should install libvirt-daemon-kvm, not libvirt-daemon-qemu, which pulls in all the not-commonly-used system emulators. This will fail on arm though since libvirt-daemon-kvm isn't available there. Maybe we should just try kvm for x86 and qemu otherwise.
NB Arm may well have KVM in F19, but if not, it will definitely have it in F20. I'd recommend attempting to install libvirt-daemon-kvm, and if packagekit reports that the package is not available, automatically fallback to try libvirt-daemon-qemu. Don't try to second guess existance of a -kvm package based on arch.
I'm just gonna make the simple change of trying to pull in libvirt-daemon-kvm and if anyone complains about lack of arm support we can fix it then.
virt-manager-0.9.5-1.fc18 has been submitted as an update for Fedora 18. https://admin.fedoraproject.org/updates/virt-manager-0.9.5-1.fc18
Package virt-manager-0.9.5-1.fc18: * should fix your issue, * was pushed to the Fedora 18 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing virt-manager-0.9.5-1.fc18' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2013-4629/virt-manager-0.9.5-1.fc18 then log in and leave karma (feedback).
virt-manager-0.9.5-1.fc18 has been pushed to the Fedora 18 stable repository. If problems still persist, please make note of it in this bug report.