I re-enabled Disqus on this site this morning. It went relatively smoothly with a nifty little tool to follow the redirects I set up in my last post and migrate the old comments over.
The rest of the internet and Disqus’s own help site suggest that they don’t support SSL in Disqus 2012, but in fact they do. This is all that’s needed to enable SSL for your Disqus plugin.
Since this doesn’t seem to be officially supported, as it’s not documented, I have no idea if it will just stop working at some point. Hopefully not!