Looks like Super Street Fighter IV: Arcade Edition is official as downloadable content for the PlayStation 3 and the Xbox 360. From the looks of this leaked trailer (which has since been pulled), the game's storyline will center around Evil Ryu, and a new character called Oni. Evil Ryu also has long hair sometimes, which is awesome.
The video also details some of the other features that will go into SSFIV:AE on home consoles. Yun and Yang (last seen in Street Fighter III: 3rd Strike), new outfits, a new replay system, a new "Elite" replay video viewing system, and some other cool stuff are all part of the package. No price has been announced, but I'm guessing that with all this new content, we're looking at $15 at least.
Now we just need this content to come to Super Street Fighter IV: 3D Edition, turning it into Super Street Fighter IV: 3D Edition Arcade Edition, and making it the longest name in Street Fighter history. Sorry Super Street Fighter II Turbo HD Remix, your time may be numbered.
Super Street Fighter IV:AE Launch Trailer [ConsoleTECH]