Although not mentioned often, EL 3 is one of the APIs that has gone through significant changes in Java EE 7. In fact, although EL has long been a very important part of APIs like JSTL, JSP, JSF, Facelets and CDI, with Java EE 7 EL got it's own JSR. Just some of the crucial changes in EL 3 include a standalone API, support for lambda expressions, static field and method access, improved collection processing and so on. Dan Woods did a pretty decent write-up of EL 3 on InfoQ. There's also the 15-minute EL 3 presentation by specification lead Kin-man Chung on the GlassFish videos YouTube channel:
An Overview of EL 3
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