I know there has been an effort years ago to support vmware vcloud director which resulted in dropping it.
our company is currently moving towards the use of vcloud director 9 for production and are dropping the support of vsphere provisioning.
it would really be nice to see vcloud support in upcoming foreman releases since the API also has increased capabilities and we think its now possible to integrate it.
products like terraform already have basic support for it but we want to use foreman for provisioning.