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These changes will make a concrete improvement to my daily productivity as a Java developer. Definitely removes some of the pain points relative to other languages.

If they can also do something about closures, I'll be much happier as a Java developer when this comes out than I am today.

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http://puredanger.com/tech/2009/11/18/closures-after-all/

The Closed By mechanism seems so obvious in retrospect. What a great improvement to stability of applications overall by embedding that simple and error retardant pattern into the language.

I'm trying to understand why the collections syntax would create only immutable collections? Anyone know why so?

It theoretically permits optimizations where multiple parts of the code using the same, say, string literal can refer to the same literal. I don't believe for a moment that this is actually happening in Java, but immutable literals are not uncommon in this class of language.

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