The newest update to Solaris 11 is known as Solaris 11.1 (rather than Solaris 11 update 1 as you can have Solaris 11 SRU1 which is different to Solaris 11.1 SRU1)
This was announced back on Oct 3 at oracle Openworld but has not been released for download just yet.
Have a look at http://www.oracle.com/technetwork/server-storage/solaris11/overview/solaris11-1-1845817.html for some details including a link to an upcoming web even for Solaris 11.1 on the 7th Nov.
And it is really just called 11.1 no 11u1 or 11 10/12. at least not in /etc/release
portrix@ptx11:~$ uname -a
SunOS ptx11 5.11 11.1 i86pc i386 i86pc
portrix@ptx11:~$ cat /etc/release
Oracle Solaris 11.1 X86
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