If you are looking for it in the interim you can find it here:
http://docs.oracle.com/cd/E23943_01/wls.htm
While this is predominantly a patchset, there are a number of new features listed in the What's New in WebLogic Server document.
Some worthy examples are:
- Java SE 7 support
- Storing transaction logs (TLOG) in a database
- GlassFish web deployment descriptor support
- Enable RESTful Web Services with JAX-RS and Jersey 1.9
- DataSource changes to support setting credentials on a connection and using proxy connections
- Application scoped JDBC drivers, where a JDBC driver can be deployed within an EAR file
