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(Via The Java Posse Google Group (Via Twitter))

Neal Gafter: A parenthesized expression can now contain additional statements, for example declarations of temporary local variables to avoid recomputing a value used only within the expression. This feature is especially useful in machine-generated code.

A simple example:

double pi2 = (double pi = Math.PI ; pi*pi);

This is comparable to the equivalent JavaFX Script:

var pi2 = {var pi = Math.PI; pi*pi};

The proposal sounds like it should be eligible for Project Coin.

But will the Java community accept language proposals from a Microsoft employee (where Neal now works.)?

Oh, wait. Java did it once already: auto-boxing, annotations, and enums.