Sun has accelerated the release of Java under the GPL. This was undoubtedly precipitated by the "SCOvell" situation; but, regardless, Sun is doing the right thing and a good thing for all technology.
There will be a huge volume on this so I'm going to lay back and let better people like Stephen O'Grady and David Berlind do what they do so well -- assess & contextualize.
Tim Bray's post is a definitive source so that's what I'm linking to now.
Open Source, GPL'd Java will be great for Linux, great for Solaris, potentially good for OpenOffice and ODF and, overall, excellent for SOA and system interoperability. Open Source Java will attract a lot more energy from kids, universities and research institutions as well as entrepreneurial hackers.