Tori Wieldt by Oracle has released an overview of all the goodies that are included in Java EE 7:
https://blogs.oracle.com/java/entry/java_ee_7_the_details
… with a couple of video presentations:
http://www.youtube.com/playlist?list=PL74xrT3oGQfCCLFJ2HCTR_iN5hV4penDz