When enabling OpenShift on existing projects, one has to pick a project from its local workspace. We currently only allow Eclipse WTP (dynamic web) projects to be chosen. Since the OpenShift server adapter is now not bound to AS7 any more and does just git push behind the scenes, everything's ready so that we could now allow java/maven projects to be picked when chooing an existing project.
We didn't do that for Beta1 since we were thinking that we should do extensive testing for this simple enhancement.