If 1.x suits your needs, fine. Angular 2 seems like it will have improved performance and be overall simpler, but 1.x will keep being supported for the time be

If 1.x suits your needs, fine. Angular 2 seems like it will have improved performance and be overall simpler, but 1.x will keep being supported for the time being. Plus it's open source, so if many people want to stay on 1.x, that's achievable. That said there will also be a migration path for your apps from 1.x to 2.0, and they have explicitly stated that you can migrate portions of your app to 2.0 without rewriting everything, so you can dip your toes in and see how you like it.