As a result of a fantastic amount of porting and validation work done by such a small team of Solaris engineers to bring GNOME 3 to the in development release.
This essentially started with a "grumbling session" between some of the core OS senior engineers.
We knew we had to do something and there were false internal rumours going around that the desktop was dead on Solaris going forward. So I led the effort to come up with a realistic plan.
My original feeling was that we had to consider options other than GNOME 3 since it as a) very big and b) was reported to depend on many Linuxisms. It turned out that yes it was big but the core requirements for doing something like Xfce and also due to the work done by others to get GNOME 3 working on *BSD it was much more viable than initially thought.
I can't take credit for the actual work that goes to Alan Coopersmith and a very dedicated group of engineers. They really care about running Solaris not just in or as the cloud but giving us a modern desktop UI to complement the core Solaris unique functionally and current GNU tools and other FOSS.
Now where is my cheese my desktop looks really different.