JMS 2 is one of the most significant parts of Java EE 7. One of the principal goals of the JMS 2 API is improving developer productivity by reducing the amount of code to work with JMS by adopting programming paradigms like higher level abstractions, dependency injection, annotations, runtime exceptions, the builder pattern and intelligent defaults. In a brief write-up JMS 2 specification lead Nigel Deakin highlights these changes by demonstrating ten concrete ways the JMS 2 API means less code as compared with JMS 1.1.
JMS 2 recently passed it's final approval ballot. You could check out the proposed final draft yourself. At 150 some pages, it is a pretty digestible specification. You can also try the API out with a GlassFish promoted build.