Follow the links:

java.sun.com
  -> J2se
    -> Reference - Documentation
      -> J2se Code Names (in page near bottom)

This page refers to 6.0 in third paragraph.
Also refers to J2SE 6.0 and J2SE 7.0 under Future Releases.

These references should say 6 and JSE 6 and JSE 7 respectively

This could mislead customer about official release names
The references should say Java SE 6 and Java SE 7. NOT J2SE!

Name change FAQ: http://javaweb.eng.sun.com/java/web/jdk/releases/mustang/FAQ.html