http://blogs.sun.com/mr/entry/liftoff
betelgeuse@pena ~/openjdk/control/build/linux-i586 $ ./bin/java -version openjdk version "1.7.0-internal" OpenJDK Runtime Environment (build 1.7.0-internal-betelgeuse_08_may_2007_21_32-b00) OpenJDK Tiered VM (build 1.7.0-internal-betelgeuse_08_may_2007_21_32-b00, mixed mode)
Stay tuned for more packaging updates on Gentoo.