Starting with the Oracle WebLogic 10.3.4 release it is now possible to upgrade to using JPA 2.0. The release includes TopLink 220.127.116.11 (with EclipseLink 2.1.2).
Since WebLogic 10.3.4 is a compliant Java EE 5 implementation it is required to ship out of the box with support for EJB 3.0 and thus JPA 1.0. If you wish to upgrade your install to allow JPA 2.0 use you must follow install a small patch, which is documented here.
If you are making use of Oracle Enterprise Pack for Eclipse the new 18.104.22.168.1 includes support for using the JPA 2.0 capabilities.