The most recent major update to the specification was approved on 17th of June 2015 and is called by many names: ECMAScript 6, ES6, ES2015, and ES6Harmony.
Based on current plans, new specs will be released on a yearly cycle. Please monitor ECMA’s news page, especially changes related to the ECMA-262 document, if you are really interested.
Shall we as developers be excited? Definitely, cause we love bleeding-edge features, however we should also consider the browsers’ compatibility list.