The extremely well-funded Cloud Foundry was already an open source PaaS, licensed under Apache 2.0. However, Pivotal will now allow a consortium of other vendors to participate in Cloud Foundry’s governance and direction. Founding members of the initiative include EMC, VMware (an EMC subsidiary), Hewlett-Packard, IBM, Rackspace, and SAP.
The OpenStack PaaS project, Solum, is new, so it has little traction. The expanded reach of the more established Cloud Foundry could end up deflating the value of Solum before it has a chance to become a significant player.