While it's true that the Japanese have had this game in arcades since July 2008, announcing a follow-up barely two months after its first worldwide release smacks of blind greed. Their claims that this new content could not be shoehorned in as DLC is a flat-out lie, and yet judging by the comments on various sites some fans are willing and eager to lap it up.
They claim the two versions will work together somehow, so those who never bought the first version or later sold it will need to get a copy in order to lock it onto the new game and unlock special extras that will already be on Super's disc in the first place. This means Capcom will sell more copies to those with the first version while simultaneously selling more copies of the first to those who start at Super. It's like that old idiom, "one hand washes the other", only you replace cooperation with greed and water with dollar bills.
Capcom clearly wants to repeat the same milking strategies they used in the '90s to such great effect; Street Fighter II had no less than seven versions. I think those days may be gone, however; gamers are increasingly expecting changes like this to be done via DLC, and ambitious, expansion-level DLC like the GTA4 episodes helps further reinforce this view. Trivially remixed retail re-releases probably don't work now unless you're EA Sports.