The good news is ES7 is actually named ES2016, and will come out in one year.
The bad news is nobody has actually stepped up to champion such an addition, so it's looking unlikely that such a feature would be implemented in 2 browsers by the mid-2016 deadline necessary for it to be part of ES2016.
ES2016? As far as I knew, the ES7 name was being kept, but the ECMAScript script would be updated yearly, as opposed to the 5 or 6 years between ES5 and ES6.
The bad news is nobody has actually stepped up to champion such an addition, so it's looking unlikely that such a feature would be implemented in 2 browsers by the mid-2016 deadline necessary for it to be part of ES2016.