I think it's currently hard to find a UI framework for Angular 2. Like you said Angular 2 is not released and as far I know the tool that you can have Angular 2 in a Angular 1 application is not ready.
I recommend you to use Angular 1. There are some things that you can use to make the change from Angular 1 to Angular 2.
Also Angular 2 is going to release next year and refactoring is always good and is a process that has to be done for a good applications.