This is what the normal GoogleBot can render, similar to Chrome version 41:
Google confirmed. Martin Splitt from Google has confirmed on Twitter that this is indeed something Google is testing. Martin said “We’re testing things all the time and sometimes these experiments are visible.”
Why we should care. If GoogleBot is able to render web pages like a modern browser, SEO Companys, publishers and content producers won’t have to worry as much when building modern web apps. These web apps won’t need workarounds like dynamic rendering to get the content crawled, indexed and potentially ranking well in Google search.