ES6 & ES7
Things TC39 focused on for ES6.
For the next iteration, ES7:
Missed for this coming release (maybe the next?):
So, now that the standards are released, when do we get to play with the new features? Once the the browsers incorporate these changes into their next release. Some have already been incorporated, such as number and array functions in Firefox. Others like let will take a while. For now, you can use ES6 with a transpiler, which will take your code and compile it into ES5 for you. We personally use the sprockets-es6 gem for this task in Rails, but there are many others options including using Babel directly for Node.