As Rich and John have already explained it, Sun’s J2EE SDK bits are now live on http://glassfish.dev.java.net. Even Marc Fleury from JBoss blogged about it before Rich (and before everyone else it seems). Not sure how he got “blog-first” privilege, but I’d be interested in the rationale of saying that something is “boring” and “irrelevant” and waste time blogging on that subject… ;-)
So the idea here behind the Glassfish project, as you see, is to open and collaborate on existing assets while preserving customers and developers interests. Oh, and NetBeans support (building and developing Glassfish) is documented here (of course).