I find that running oVirt 4.1.1 I can not import any debian based VMs as virt-v2v/libguestfs is too old.
This bug report https://bugzilla.redhat.com/show_bug.cgi?id=1362497 indicates that newer versions of libguestfs support importing debian and Ubuntu VMs. 

Are there any plans to include a newer version of libguestfs in oVirt soon? If I built a newer version of libguestfs on my ovirt-node would it break everything?

Regards

Simon