There's only one supported OpenIndiana distribution - OpenIndiana Hipster. It uses rolling-release model. We try to ship up-to-date illumos-gate and userland software. As work for migration from old build systems to oi-userland is still not complete, some soft in OpenIndiana can be rather outdated and /hipster receive major updates. As result, breakages can happen. We try hard to avoid this. But be warned.
Legacy OpenIndiana /dev branch is currently not supported and shouldn't be used in production.