Google's Igor Minar said at the recent NG-BE 2016 Angular conference in Belgium that Google will jump from version 2 to version 4 so that the number of the upgrade correlates with the Angular version 4 router planned for usage with the release.
Minar, in fact, laid out a roadmap that has eight beta releases of Angular 4 coming out between December and February, followed by two release candidates in February and the general release on March 1. But Minar cautioned against getting too hung up on numbers and advised that the framework simply be called "Angular" anyway. "Let's not call it AngularJS, let's not call it Angular 2," he said, "because as we are releasing more and more of these versions, it's going to be super-confusing for everybody."
Angular is on an aggressive schedule that would have Angular 5 arriving in September/October 2017, followed in six months by Angular 6, with Angular 7 coming six months later in September/October 2018.
Google's goals for Angular 4 are to be as backward-compatible with Angular 2 as possible and to improve compiler error messages. In November, Google talked about the next version of Angular, then referred to as version 3, emphasizing improvements in tooling as well as reduced code generation.
Earlier this month, Google earlier this month released Angular 2.3, a minor upgrade featuring Angular Language Service, which is designed to integrate with IDEs and provide type completion and error-checking with Angular Templates. Object inheritance for components is featured as well. Angular 2.2 arrived in November, featuring ahead-of-time compilation compatibility.