Angular 2 first announced on September 2014. After Angular 2.0.0-alpha.55 Angular Team released ‘Beta’ Version.
What is mean of ‘Beta’ Version. Beta version means that Angular 2 framework is ready to build large application. Google also using Angular 2 to develop several large projects like AdWords, GreenTea (Google's internal CRM system), and Google Fiber.
Angular 2 focus not only building web application its also design to deliver robust, high performance mobile application for Android, iOS, Windows etc. Many mobile application teams including Ionic Framework on Ionic 2, Telerik on NativeScript and many others working closely with Angular 2 to design an Angular 2 based robust mobile application framework.
Angular 2 mainly focused on speed . Angular 2 renders pages up to eight time faster then Angular 1.
Angular 2 improving day by day Change Log can be view here
Learn more about Angular 2 here - https://angular.io/