With both Oracle and IBM pledging to collaborate and allow developers to build on the Open JDK project there is a petition setup for Apple to donate their existing JDK for Mac OS X to the BSD Port.
"Apple has recently announced that it would prefer if someone else were to continue the development of the JDK for Mac OS X. As Apple's own JDK is mature and well-integrated, we would love to see Apple contributing the source code of the existing JDK for Mac OS X to the OpenJDK BSD Port project (http://openjdk.java.net/projects/bsd-port)."
Add your signature to the other 3500+ (and growing) at: http://www.petitionspot.com/petitions/macjdk