At the moment Adobe is lending both manpower and knowledgde to the open-source project called Tamarin. Tamarin is an attempt of creating a new OO-based JavaScript 2.0 standard up and running. Since both JS2.0 and Actionscript will be based on the ECMA-262-v4 standard it’s easy to understands Adobe’s “goodwill” regarding this project. (Erh… future incorporation of whole or part of Flash Player (AVM2) into browsers, for instance)
However, Tamarin is a joint venture by Mozilla, Adobe, Microsoft, Apple, Opera etc and will likely pass as the future standard for the long awaited JS2.0 standard. Tamarin will be licenced under GPL, which means free use without modification.

Tamarin will be deployed in Firefox and SpiderMonkey as of autumn 2008, and the rest will follow.

Further reading: Tamarin FAQ

T:)