So much to write about so little time...
If you haven't started your download already you should, this is a major new release of JDeveloper and it has tons of new features detailed here.
Some personal favorites features include
Hot deployment - even if you changed the binding layer just save, compile and reload your page in the browser - no need to rerun the application.
Thematic Map - should start appearing in my dsahboard demos on a regular basis now.
Skin Editor - will allow my skinning presentation at ODTUG's KScope conference to be much more around a visual demo.
OSGi architecture - I don't care about the low level architecture- just about the results which are better memory usage and performance.
JSF 2 support - again not much changes in terms of how I demo - but it is nice to be able to say that JDeveloper has the best support for the latest JSF standard compared to any other IDE.
New look - always fun to feel you are using a brand new thing...
I'll try and blog in more details about specific features in the next couple of weeks.