Don't wait. First, no guarantee that stuff will actually get adopted, it's still quite abstract. Second, even if so, it will take a while for browsers to catch up, so people will be coding in current JS for a while. Third, much of the current conceptual hurdles will still be relevant, particularly functional style and async design patterns.
Would highly recommend Javascript: The Good Parts, don't know where I would be without it.
Would highly recommend Javascript: The Good Parts, don't know where I would be without it.