Flynn cofounder here. The primary difference between Flynn and cloudfoundry, dawn, deis, dokku, octohost, openshift, tsuru, etc is that Flynn is designed to run everything itself, not just 12 factor web apps. Most immediately this means that you can run databases inside of Flynn alongside other apps. In fact we've already wrapped up postgres.

Flynn also tries to be more technology agnostic, for example we don't depend on CoreOS or Docker.

It's worth noting that several of the other platforms including Deis claim to be production ready today while Flynn is still a few months out.

The difference in both features and goals will be a lot clearer in the coming months. What we have today is just the foundation and minimum viable feature set. Once that's rock solid, the real work gets started.