DOM ref is now typed as Js.null Dom.element, instead of just Dom.element (https://github.com/reasonml/reason-react/commit/6f2a75b). Trivial migration: https://github.com/chenglou/reason-react-example/commit/b44587a
Add defaultValue prop for input DOM component (https://github.com/reasonml/reason-react/commit/c293c6e)
Correct type of dangerouslySetInnerHTML (#76)
Lots of great people working together.