The ECMA has released resources to the public reflecting the 4th edition of the standard. Being that ActionScript implements the ECMAScript standard, these future implementations will most likely become part of ActionScript in the future.
Adobe has members on the committee which is evident as many of the new features are following ActionScript 3’s lead (such as strict and standard modes).
The link below is a good starting point to see where ActionScript, not to mention Java, C# and many other languages will be heading in the future.
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