Along with adding support for OpenStack in vSphere, VMware also announced this week at VMworld that they are rolling out their joint initiative with Pivotal (a spinoff from VMware that owns SpringSource and Cloud Foundry). The commercially supported flavor of the open source Cloud Foundry PaaS that Pivotal provides, called Pivotal CF, will now be a hybrid PaaS offering available on vSphere and vCloud hybrid services.
VMware is not providing any compatibility with Amazon, however. So customers will need to work entirely with VMware.
Here's a Pivotal CF Demo video: