Following the release of React 16.2.0, has been upgraded to bundle React 16 by default. Per the wiki, React 15 support is being maintained on a branch.

Support is also included for Fragments:

"A common pattern in React is for a component to return multiple elements. Fragments let you group a list of children without adding extra nodes to the DOM."

Here is an example of a react.Fragment being used:

func (a AppDef) Render() react.Element {
  return react.Fragment(
            react.S("Hello World"),
            react.S("This is my first GopherJS React App."),

Please raise any issues on Github.