The real question is: When can we use this new features? Now!? Browser vendors are working hard to implement this and the latest browsers are shipping big parts of the specification already. This website tracks the progress of the latest browsers. You can see a lot of red in this table – that’s why Traceur (compiles ES6 to ES5) comes to the rescue. –> So that your code will work in all modern browsers!
In this talk, Erik from the AngularJS Team explains, which additional features of ES6 will be used in Angular 2.0 and how Traceur works. There is also a Chrome extension named “ES6 transpiler based on Traceur” where you can try out your latest ES6 code