Snapshots with vCloud Director 5.1 & PowerCLI 5.1

(cross-post from vCloud forum)

Now that vCloud Director 5.1 supports snapshots, I am looking at the  PowerCLI 5.1 cmdlets and cannot find a way to create/manage/revert  snapshots.  I see it is there in the API, but don't see a way to  interface via PowerCLI.  Any ideas?