React Async has no direct relation to Concurrent React. They are conceptually close, but not the same. React Async is meant to make dealing with asynchronous business logic easier. Concurrent React will make those features have less impact on performance and usability. When Suspense lands, React Async will make full use of Suspense features. In fact, you can already start using React Async right now, and in a later update, you'll get Suspense features for free. In fact, React Async already has experimental support for Suspense, by passing the suspense option.