NetBeans 7.3.1 release which finally supports Java EE 7 isn't available as of today. The commercial offering which is called "Oracle GlassFish Server" also didn't seem to have hit it's place on OTN.
New Java EE 7 Example
Java EE 7 Example. The "First Cup" application calculates the age of Duke, the Java mascot and interacts with the users. Duke was born May 23, 1995, when the first demo of Java technology was publicly released. It contains JAX-RS, EJB, JSF and JPA. Find the source and some more information on the java.net project website. The complete code is developed under a BSD license and you're free to play around with it.
Now that everything already is here there is still some time to register for the Java EE 7 launch event tomorrow.
Links and further reading:
Official Java EE 7 SDK on OTN
Java EE 7 API
The Java EE 7 Tutorial
Your First Cup: An Introduction to the Java EE Platform
Java EE 7 Technical Documentation