JDeveloper is once again being touted as the flagship IDE of Oracle and all its' major platforms. The new 11g version will be release "sometime in 2008". Some of the features of this new version already being touted:
A new set of ADF Faces are being released to deliver web 2.0 type behavior.
Extending ADF Faces skins will be possible. This includes extending the Oracle default look and feel.
Even more declarative options for 4GL developers.
A JavaScript API will be provided.
Templating will be possible with the ability to create and use your own templates. Again, these will be extendable.
More SQL Developer type operations will be possible in the connection manager.