Issue title: Project Page update
 Issue body: Hey, just wandering if the Project page can be updated. I'm specifically wandering if ES6 classes will make it into 0.12. 

 Comments: 
 Comment 0: I need to do a general update of that page. I think we aren't going to have ES6 classes in 0.12 since we have a bunch of other changes, likely 0.13.

 Comment 1: ok, thanks

{'source': 'GithubIssues', 'repo_name_with_owner': 'facebook/react', 'issue_id': 41507891, 'repo_stars': 197109.0}