There is a draft version of the "Whats new" document for the OpenSolaris 2010.03 release available online. It lists the major new features thats available with the upcoming release. It will probably make you eager to update once it's released unless you are already using the development repositories.
What's New in OpenSolaris 2010.03 (DRAFT)
The sudden death and eternal life of Solaris
3 months ago