A demonstration of Hooks is live right now at ReactConf and looks very cool: https://www.youtube.com/watch?v=kz3nVya45uQ (go back about 1.5 hrs into the past to see the start of the demo).
If you like live coding demos, he also gave a talk at JSConf Iceland where he showed off some future React features, such as asynchronous rendering: https://www.youtube.com/watch?v=nLF0n9SACd4