As was brought up in the forums this morning and then confirmed, the source-code to Oracle's Solaris 11 kernel was leaked onto the Internet over the weekend via torrent sites. The kernel source-code is based upon build 175 and the ZFS zpool is at version 33.
In August of 2010 was when Oracle killed OpenSolaris and changed the Solaris development model after most of the operating system's code-base had been opened up by Sun Microsystems back in 2005 during the Project Indiana days.
Oracle hasn't provided any open-source updates yet to the kernel but they do make some code available to Oracle Technology Network members. Oracle Solaris 11 was officially released last month without any public source-code drop.
The compressed 100MB package is of a Solaris 11 kernel snapshot but not the source to any other parts of the new operating system's stack. Details in the forums.