This actually belongs to the services developed for the Kyrillic users. You have to sign in to it in the settings, so that it appears (the option: "Opt me into services originally developed for the Cyrillic users"). Why it appears to everyone else today, no idea. But it appears they've been doing something in the background actively for a few days already. People who had posts from Writer's Block in their journals, they also appeared to look different than before (the posts, not the journals), and that's not been until very recently.
(no subject)
Date: 2014-10-31 02:08 pm (UTC)