I really missed the point of that
InternetWeek article yesterday. Oracle is not ready to ditch JDeveloper. They are joining Eclipse.ORG because they want to push their new Java Specification Request (
JSR-198) that standardizes the way that tools plug-in to an IDE.
Oracle sees the possibility of the Eclipse dominates scenario and wants to try to ensure that Eclipse does not become the universal tools platform. JSR-198 attempts to level the playing field for IDEs in the plugin tools space.