|App Server||Deploy Bundle||WAB Support*||EJB/JPA|
This is all interesting you might think, but what impact will that have on the Java EE architecture? I would say a rather a lot. Lets start with the deployment. All Java EE deployable are monolithic, think of web and ear. They all package everything in on single file. How does that go with the OSGi moduling thinking? Not at all. The OSGi concept is programming modules and make them interchangeable, deployable as separate module and with own versions lifecycle. So this has to change if one want to bring the OSGi thinking to the Java EE arena.
If you want to play with OSGi I would recommend Eclipse and install the bnd tool (http://bndtools.org/).
And if you want to read more about OSGI OSGi in Action by Manning is a great book.
And at more architecture level I would recommend Java Application Architecture