Is it correct that the NG team is not going to provide documentation for those who want to write in ESNext (i.e. ES2015) without using Typescript?

An example of where this would be useful is when you're trying to inject services in other services. The current solution seems to rely on either Typescript or parameter decorators (not in the Ecmascript decorator proposal). Given that "ES2015" was presented as a proposed platform for Angular 2 at NgConnect, it seems like there should be a clear path for those who want to use this platform. Also, when the team says "ES2015" do they mean actual ES2015 (which has no decorators at all) or ESNext... i.e. some future unknown javascript that would include decorators and perhaps even parameter decorators?