With release 4.0, Oracle brings Apex to the next level. It includes new features like Plug-ins, allowing you to custom design your own item types and reuse them wherever needed. Dynamic actions make it a lot easier to declaratively create interactive functionality, relieving the developer of the more complex task of scripting in AJAX or javascript.
Some other new features: improved charting, improved interactive reports, improved application builder, REST Web Services, websheets, ...
Even an 'Apex Advisor' is introduced which searches your application for poor coding practices!
Check it all out on http://apex.oracle.com/
