First up: a rationalized ECMAScript 3.1
The "Harmony" road map starts with an effort to finalize ECMAScript 3.1, essentially a rationalization of the current version, and produce two interoperable implementations by spring 2009. "I think you could characterize 3.1 as a maintenance release," says John Neumann, chair of the technical committee. The ECMAScript 3.1 effort will formalize bug fixes but also standardize across all implementations some of the improvements made in the field, Neumann says. That's key, so applications written for one browser will work in another.
After the ECMAScript 3.1 effort, work will then proceed on a more significant ECMAScript successor dubbed Harmony.