Back in December, Ecma created a new technical committee named TC52 to publish a standard specification of the Dart language. The inaugural TC52 meeting takes place on March 12, 2014 in Mountain View, California. In addition to ratifying the current spec, the committee plans to address proposals for Enums and Deferred Loading. If time permits, we’ll initiate work on the broader set of features to be added for Dart 2.0.
TC52 would love to see contributions to the Dart language specification from many players in the industry. Please come and join the committee, it's not too late to get involved. For language requests in general, the issue tracker - dartbug.com - is a great place to start the discussion. The TC52 committee will pull from the issue tracker.