Q: When will there be any port to {Netbeans/JEdit/Notepad/my-favorite-java-IDE}? Why don't you create a yet-another-java-IDE from scratch?
A: There won't be, unless someone decides to start another similar project targeting your favorite IDE. This project is aimed to Eclipse Platform.
Eclipse was designed in a very nice plugin architeture, so it is very easy to extend/interact/reutilize current features provided by JDT (which by itself are very good). So, create a new IDE from scratch is the same as reinvent-the-wheel.
Q: I want to contribute to project. How can I do this?
A: You can submit patches using sourceforge tracking system. If you turn to be a significant contributor, I can create a commiter account in the project.