Key highlights as stated by Guillaume: - a static type checker to let the compiler tell you about the correctness of your code, - static compilation for the p

Key highlights as stated by Guillaume: - a static type checker to let the compiler tell you about the correctness of your code, - static compilation for the performance of the critical parts of your application, - modularity, splitting the Groovy JAR into smaller feature-oriented JARs and letting you create your own extension modules, - JDK 7 Project Coin syntax enhancements, so that Groovy is still as friendly as possible with its Java cousin, - and JDK 7 Invoke Dynamic integration to benefit from the support of the JVM for dynamic languages.