First thing when considering adding a hypervisor is to email openstack-dev with the subject starting with [nova] and explain the new hypervisor and ask advice.

Several attempts have been made in the past to add a new hypervisor which have started in the 'wrong' way and caused a fair amount of effort. It's also possible that someone else is working on adding support for the hypervisor you like.

If you can add the hypervisor to libvirt that may be an easier approach than writing a new Nova driver.