The video mentions that they use a technique to include comments that provides proper SEO (and feels natural to Google). Any information on what they've done? I remember previously, they had a WordPress plugin that brought Disqus comments back to your site for SEO purposes.
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We'll be talking more about this in the future. For now it's mostly in prototype/draft form, but we have confirmed that it is supported.
from the comment thread on the blog post, one of the devs responded to the Q "So I guess this uses Google's AJAX/JavaScript crawler feature?" with "That's right. Content is still not in the page HTML, but it'll be compatible with the new crawler."