It's the 10th anniversary of Java (history), and with this milestone, Sun is renaming the platform. According to "Building and Strengthening the Java Brand," Sun is renaming Java 2 Platform, Enterprise Edition (J2EE) to "Java EE." Likewise, J2SE will be renamed Java SE.
The change will take place with the next releases of the platforms, Java SE 6 (Java Platform, Standard Edition 6) and Java EE 5 (Java Platform, Enterprise Edition 5). Also, the version number is a whole number (such as 5, not 5.0). According to TechNews, the new web page for enterprise edition will be http://java.sun.com/ee/ (which doesn't seem to work yet).
Oh yeah, Sun is also open souring its J2EE reference implementation/application server product, Sun Java System Application Server Platform Edition 9.0 (AS PE 9.0) in a project called GlassFish. I thought it was already open source, but apparently it was just free. As usual, there seems to be questions about how Sun licenses open source.
Finally, in case there was any doubt, IBM has licensed Java for another 10 years.
Also, Bill has already commented on Sun's renaming J2SE 1.5 to J2SE 5.0 and now going back to calling the SDK the JDK.
Java: Java SE 6 and Java EE 5