Ember.js 1.0 was release in 2013. The udpate pipeline strictly follows the Semantic Versioning standard. There is a new minor version every six week. Backward compatibility is extremely important. Ember.js 2 was released middle of last year, the transition from v1 to v2 was super smooth. Big startups and corporates (like financial companies) are migrating to Ember.js, because of the stability and because of the opinionated, convention over configuration features. An Ember developer can jump in someone else Ember project immediately, because most of the Ember.js app follows the same principals and rules. This is a good video about how Intercom.io was able to ship new features much faster and more often because of they switched to Ember:
https://www.youtube.com/watch?v=fVwDuMGVhYY&sns=twI read this article about Meteor recently. https://www.discovermeteor.com/blog/the-state-of-meteor-part...
Looks, they have to find a new way. It is kind of the same story as happened with Angular, the Angular 1 was a cul-de-sac and they had to build up a totally new framework from scratch.
Meanwhile Ember adapts the best solutions all the time. Ember begun to use ES6 almost two years ago. Implemented React inspired view layer a year ago. Server side rendering just released a couple of weeks ago. Ember-cli stable version is released a year ago, which is so good, that Angular 2 would like a similar cli tool, and of course Ember-cli team helps them. Hopefully Angular 2 will have a cli tool by middle of this year.
We could say, that Ember.js is at least 1 or maybe 2 years ahead of other javascript libraries or frameworks in more aspects at the moment.
Suggested pages: http://www.emberjs.com, http://www.ember-cli.com, http://yoember.com, https://guides.emberjs.com/v2.3.0/ http://www.emberjs.com/community
Here is a fresh report, which mirrors how serious the community behind this open source project: http://emberjs.com/blog/2016/01/23/core-team-face-to-face-ja...
Be careful, because if you start learning Ember.js, you will fall in love and you don't want to work with other javascript library any more. ;)