The currently advertised OpenIndiana release is OpenIndiana 151a, which was released last year to mark the one year anniversary of the project following Oracle dissolving the once promising Sun Microsystems' OpenSolaris and Project Indiana initiatives.
This OpenSolaris fork, which is developed under Illumos, is now gearing up for the third update to OpenIndiana 151a. Released this past Thursday was "oi_151a_prestable2" as the latest development snapshot leading up to this third update.
As indicated by the Wiki release notes for this new version, there's some bug-fixes but nothing overly exciting. There's also still no presence of a better graphics stack or other features to play catch-up with Linux in some areas.
Does the open-source Solaris community remain relevant?