The Ubuntu development team, through James Page, announced a couple of days ago (June 6th) that they plan to move to OpenJDK 7 as the default Java Runtime Environment.
OpenJDK 6 will be replaced by OpenJDK 7, and it will be moved to the Universe repository, to be used in case some apps don't work with the new version.
"As Mathias highlighted during the opening of Quantal, OpenJDK 7 is now used as default for packages depending on default-[jdk,jre,jre-headless] - so any packages that rely on default-jdk will automatically build with this new version of Java." - said James Page on an email to the Ubuntu development mailinglist.
The first Alpha version of Ubuntu 12.10 (Quantal Quetzal) has been released yesterday, July 7th, and it brings Linux kernel 3.4, Firefox 13, Thunderbird 13, and lots of other improvements.