Too Long; Didn't Read
After large ES6 release, that took about 6 years (Dec 2009 — Jun 2015) to get standardized, TC39 committee has given notice of annual but smaller releases, starting with ECMAScript 2016 (ES7). The final feature set of ES8 hasn’t been approved yet, as on Feb 2017, though we can suppose that all the specs from stage 4 and most of the stage 3 will be included in ES2017. The proposed feature set appears as follows: