The 'latest revision of the future specification' you link to is, I think, the set of things the TC39 group has considered and agreed on. The list of things the

The 'latest revision of the future specification' you link to is, I think, the set of things the TC39 group has considered and agreed on. The list of things they are currently considering is in the strawman namespace[1] on that wiki. In particular, the "strawman:concurrency" page[2] currently says: The infix “!” operator: An eventual analog of “.“, for making eventual requests look more like immediate requests. [1]: http://wiki.ecmascript.org/doku.php?id=strawman:strawman http://wiki.ecmascript.org/doku.php?id=strawman:strawman [2]: http://wiki.ecmascript.org/doku.php?id=strawman:concurrency http://wiki.ecmascript.org/doku.php?id=strawman:concurrency