Solaris 11 is public available and the IPS package management is setting new standards in Solaris administration and version management.
Everyone who develops software for this platform will want to make sure that the application users are using the optimal Solaris 11 infrastructure. The Oracle binary guarantee warrants that an application will work on any Solaris 11 release no matter which minor revision the kernel has. It's however a reasonable idea to ask a user to be at same minimum patch level you qualified your application on.