According to the press release, Red Hat announced today that it is joining the OpenJDK community.
This is an interesting topic, though, the background, as I see it, may be marketing rather than technological.
Nowadays press releases are a purely marketing engine. Sun is a big shop, RedHat is not an exactly small one too, at least in terms of mind share. This means that the release has gone through a thorough polishing and whatever the message is, it is sent to analysts and [possibly] shareholders.
This is a total speculation, but what about RedHat trying to ride the wave of disappointment caused by lack of Java 6 on Mac OS X? Is it possible that RedHat is displaying full collaboration with Sun, as compared to "non-collaborative" Apple which may be seen by RedHat as a rival on non-Windows OS market?
For Sun it would be just "good publicity never hurts".
I am thinking about these options on because, let us be serious, there haven't been any real problems running Java on RedHat or any other Linux distributions for years. It takes me 2 minutes or less to have a Java app running on RedHat, even while comparing to "native" Perl, Ruby or PHP apps requiring downloading hundreds of megabytes dependencies.