GlassFish 4.0, the reference implementation and therefore the first application server for Java EE 7, has been released. The release was announced on Monday 06/11/2013 on the new and overworked website.
The site was launched obviously too early: at launch time, there was no NetBeans 7.3.1. with Java EE 7 support available, although it was linked on the IDE support page, and there was no Glassfish download on the Oracle Technology Network.
A new Java EE 7 example named “Your first Cup” using Glassfish 4.0 can be found here.