@angular/router status for ionic2-rc0

We cannot find any detail guideline for the recommended routing solution for ionic2-rc0 in the Internet. Should we use NavController or @angular/router in ionic2 rc0?

We were using NavController before upgrading to rc0 and we were happy about using it. However, it seems we need to use @angular/router in order to truly benefits from lazy loading. That is why we are thinking about switching to @angular/router. Since we had a lots of pages, we would like to confirm with the ionic team first.

BTW, we saw a error message: ‘inline template:0:0 caused by: No provider for NavController!’, any ideas?