Developer Preview Release was officially announced today at JavaOne by Hasan Rizvi

[Henri Gomez]

I'm still wondering about the b211 in Oracle Preview whereas we're
still in b210 in OpenJDK macosx-port branch.

BTW, new packages from openjdk-osx-build project are available :

JDK : http://openjdk-osx-build.googlecode.com/files/OpenJDK-OSX-1.7-universal-jdk-b210-20111005.dmg
JRE : http://openjdk-osx-build.googlecode.com/files/OpenJDK-OSX-1.7-universal-jre-b210-20111005.dmg

Main fix is detection by Java Preferences UI and /usr/libexec/java_home

Changelog here : http://code.google.com/p/openjdk-osx-build/wiki/Changelog

Cheers