I'm looking in to it, but from what I can tell it actually seems to be an issue with blog.us.playstation.com disabling embeds, which would be a very strange coincidence if that just happened to have changed after I updated.
Other links appear to be working fine though?
EDIT: Looks likes it's the way that Discourse now embeds links. It no longer requires a white list, meaning any link should theoretically work, but some sites can disable the way Discourse is now embedding, which it appears that blog is. Bummer.