I've been using OpenJDK builds found at http://code.google.com/p/openjdk-osx-build/. As far as I can tell, the OpenJDK project itself does not include the port as part of the JDK7 release but more so as a related project between Oracle and Apple.
The Mac OS X port will not be ready in time for JDK 7. It's more of a JDK 8 timeframe project. In the meantime, you can build it yourself; the only feature difference from bsd-port is i386/x86-64 universal binary support.