As far as we know, Oracle has stopped developing OpenSolaris in the open. For those of us, who would rather have Opensolaris become a real openly developed operating system, ptoject illumos came to life. Thanks to Garrett d'Amore et consortes. On the illumos wiki page there is a nice instruction on compiling your own post build 134 illumos source.
Already much work has been put in the source tree to liberate it from dependency on /extra repository and new putbacks arrive all the time.
If you'd like to check it for yourself, here is the link to How to build illumos guide.