There are conveniences that a proper PaaS could provide on top of Kubernetes, e.g. Heroku's deploy-on-Git-push feature. I just don't know if that's the kind of thing this project is targeted at.
Don't know alternatives well enough to compare. Disclaimer: I work at Red Hat on manageiq/openshift integration.
Operations loves flavor of the month tools under active development, right?
The others (Java, PHP, Staticfile, Binary) were written specifically for Cloud Foundry.
Source: I worked on the CF Buildpacks team for a while.
Disclaimer: I work on Flynn