This will be fixed rebasing on top of upstream 3.5.5.0.
ok, rhevm-backend-3.5.5-0.1.el6ev.noarch created a windows 7 64bit vm and started that via python sdk, no sysprep was attached in first run (default is not attaching sysprep). sysprep was not attached even for subsequent start of the VM via python sdk.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHEA-2015-1940.html