The Oracle Solaris Binary Application Guarantee is now covering Oracle Solaris 10 as well as 11. Oracle extended the program through 2013. The program covers a source code guarantee as well as a binary guarantee. Details can be found in the program description.
The SAS Institute is supporting their flagship application the analytical SAS Foundation 9.3 on Solaris 11. The SAS support note states that SAS Foundation 9.3 is supported on SPARC with Solaris 10 update 8 and Solaris 11.
Solaris 11 Express is amazingly backwards compatible to Solaris 10. Some commands (mainly deprecated ones) went to different locations or they aren't anymore available through the initial default installations. scalingbits started tracking these commands including ways to keep scripts working on Solaris 10 as well on Solaris 11 Express.