Server rendering.
Testing.
Some experimental syntax extensions (e.g. decorators).
CSS Modules.
LESS or Sass.
Hot reloading of components.
So a great first set of features for a simple React starter project, but for those of you looking to expand the development toolkit from this currently limited configuration, check out the following link to search React boiler projects on github based on a number of criteria like the ability to search by features included such as CSS Modules, Hot Module Replacement, etc.
I'll try to post what I can remember/find below:
https://github.com/timarney/react-faq
https://github.com/enaqx/awesome-react
https://github.com/markerikson/react-redux-links
https://thisweekinreact.com/
http://reactjsnewsletter.com/
React boilerplates meta-search: http://andrewhfarmer.com/starter-project/
Discord server: https://facebook.github.io/react/blog/2015/10/19/reactiflux-...
General JavaScript: http://javascriptweekly.com/