The current version of OpenSolaris is osol-0811-98. It is reported to be
the development version of Solaris 11. This is Solaris Express, sometimes
called Nevada, build 98:
$ uname -a
SunOS einstein 5.11 snv_98 i86pc i386 i86pc
No idea; check the HCL
There are lists for Solaris 10, OpenSolaris and Solaris Express.