React Suspense is still in development, but you can test it right now.
I made topheman/react-fiber-experiments, a tool that should help you understand it.
Demo: https://react-fiber-experiments.surge...
Github: https://github.com/topheman/react-fib...
Blog post: http://dev.topheman.com/discover-reac...
Slides: https://topheman.github.io/talks/reac...
Version française: http://dev.topheman.com/decouvrir-rea...