CloudFS is built on top of Gluster. It provides a set of translators to make Gluster more suitable as a cloud file system.
The Fedora CloudFS feature page has information about the status of CloudFS as a feature in a future release of Fedora.
CloudFS Setup has rudimentary instructions, including where to get source and RPMs, for installing CloudFS on a cluster, including a simple web-based UI to provision CloudFS volumes.
See Jeff Darcy's CloudFS blog to learn more about the philosophy of CloudFS and find out what's happening with CloudFS development.