Is that you can now, apparently, resign games on your opponent's move.
This is very useful for players like me, who grab a pawn, hit the move button without looking, then gape in horror and hit the "back" button to confirm the subconscious observation that the queen has just been hung. Now, you (uh, me) can resign straight away, instead of waiting for the opponent to see and grab it. Thank you, Russ, for that generous new addition to the site.
Laugh at me. Be cruel. Tell me that my chess-playing skill has actually degenerated to the scores-of-timeouts-the-last-time-I-was-on-RHP 400 points down level that it's currently sitting at. If you're all mean enough, maybe it'll condition me to pay attention in the future.