http://www.eventhubs.com/news/2009/nov/05/big-announcement-ssf4-new-online-modes/
These are the confirmed online game modes for Super Street Fighter IV, though there may be more added as it's still work in progress. Also, we can finally have groups in a room with winner stays on. That was my favourite thing about HD Remix, since it was a great way to socialise, pick up new tips and enjoy the game all at the same time.