There is no official plan to support react.js as of now (March 2017).
There is a blog post on how you can use react.js to create CMS widget. And remember this is just an experminatl purpose, Episerver don't support react.
<p>Hi. By the way I am talking about front-end not Admin UI. From this thread <a href="/Modules/Forum/Pages/Thread.aspx?id=152604">http://world.episerver.com/Modules/Forum/Pages/Thread.aspx?id=152604</a> it looks like React.js can be used with Episerver page or block type. Basically I need to create a block highly interactive like online calculator. </p>
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<p>Regards.</p>
<p>Brian.</p>
Hi. Is there any plan to support react.js from CMS directly?