Not so much to fork, but Angular 1.x is continuing to be developed and Pete Bacon Darwin has taken over as the technical lead: https://plus.google.com/+IgorMinar/posts/2Uo6yh4AV7L

Angular 1.4 is well underway and there's a lot of good stuff coming out of it, for example the reworked router module.

FYI the new router module (https://github.com/angular/router) is going to be a separate project, with semver'ed releases. It'll expose bindings for both Angular 1.x and Angular 2, but it isn't bound to the Angular release cycle.

Here's a presentation from ng-conf today about the new router: https://www.youtube.com/watch?v=vecg70fPDFw

The official word[1] from the Angular team now is that they will support it as long as there is still a significant number of companies using it - it will be longer than the original 1.5 years after the release of 2.0 mentioned.

[1] Mentioned in the ng-conf keynote IIRC, but this was also told to me directly by one of the Angular core team members when I spoke with him today.