Facebook has released React v0.13, bringing with it support for ES6 classes, as well as new top-level APIs and breaking changes for JSX.
CoffeeScript 1.9 has finally introduced support for long awaited generators, which promise to prevent callback hell and help writing async code.
The io.js team has released version 1.0 -- but the versioning does not suggest the platform is "production ready." Despite overtaking Node, io.js clarifies the release in its own FAQ: "The choice to release as 1.0.x was not to signify that io.js should be considered production-ready, but because it was a significant enough release from Node.js to warrant a major version increment," it says.
Ecma International has standardized the first edition of Dart, ECMA-408.
The NodeJS based Koa web application framework has released version 0.2.0. Koa is the successor of the popular Express MVC platform, but relies heavily on newer ES6 constructs. This release is marked as an important one in that that it reaffirms the team’s design choices from the initial 0.1.0 release, solidifying Koa's API for future releases and production use.
The recently released Dart 1.1 comes with better performance for the dart2js compiler and improves support for the server-side development. The language itself is pretty much on hold.
ECMAScript 5 was standardized in late 2009 but only recently has it has started showing up in browsers. It supersedes the 3rd edition, which was ratified in 1999. ECMAScript 5 is actually two languages, ES5/Default and ES5/Strict. Future versions are going to be built on top of ES5/Strict and it is recommended that the default version be avoided.
The ECMA working group in charge of the Common Language Infrastructure standard has produced released a working draft of the 5th edition. The CLI represents the subset of Microsoft’s .NET platform that has been placed in the care of Ecma International. Originally known as the European Computer Manufacturers Association, Ecma International both competes with and complements ISO.