I spent half a day implementing the server side html generation for modal pages based on their proposal (link), but it seems like the Fetch as Googlebot functionality in Webmaster tools completely ignores the URL fragment.

I've verified that the _escaped_fragment_ functionality is working on my server (example), but when I submit a URL like /#!/recipes, the Googlebot just fetches /.

There aren't any recent confirmations that it's working and, honestly, it wouldn't surprise me if they just silently dropped the functionality without even editing the docs.