Solaris 11 will be release 2011/11/09 (2011/11/11 was not optimal for some reason).
Oracle will host a launch event in New York and you can register to attend to the live webcast.
Even if I have abandoned Solaris 11 for OpenIndiana for storage related installations, Solaris 11 have it's obvious place on bigger iron in the datacenter or for any mission critical workload that needs enterprise support. I would gladly have continued to use Solaris 11 for storage but the change made by Oracle to ditch the community and move to closed source and stricter licensing prevents that.
This will make fantastic features such as crossbow, IPS, Native CIFS and COMSTAR available for use in production environments. Many enhancements for zones have also been made, they can for example be NFS servers in Solaris 11.
Also if you want to make the most use of the new SPARC T4, Solaris 11 is the best choice since not every change usable to the T4 have been ported back to Solaris 10 8/11.
If you pay for support of Solaris 11, please demand that Oracle gives you access to the source, DTrace will loose it's value otherwise and I think Oracle needs to hear that.
Oracle Solaris 11 Launch webcast
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