Why would anyone try to introduce an operating system into the existing glut unless it pays off in spades? What can a new entrant give us that the multitude of Linux distributions, the Mac OSX and old, hoary Windows hasn't?
Sun Microsystems apparently thinks it has a lot to offer - else the so-called Project Indiana would not have been set up to churn out "a binary distribution of an operating system built out of the OpenSolaris source code."
http://www.linuxlinks.com/portal/news/article.php?story=20080526154335377