Ryan "Gootecks" Gutierrez posted on his Twitter account that he heard from a "strong source" that downloadable content (DLC) characters will be added to Super Street Fighter 4.
read this over at eventhubs, so you never know. They might have some new characters for the arcade release then those characters would then get patched in for dlc for the consoles is my guess.
My guesses are Rainbow Mika and Rolento if they do.
Get your Portable ID!
SSFIV Main: Cammy