[quote name='Hardware']I own SFIV, but I honestly have no idea what you are talking about or asking. I haven't looked into it. I do remember Capcom promising that owners of SFIV would get something FREE??? since SSFIV was coming out, but I never heard an update to that.[/QUOTE]It's as he said, if you have a save file from the original SF4, you get two graphical filters to use with each character. One draws a thicker line around the outline of the character, the other gives them a water color appearance.
[quote name='eugaet']EDIT: I think I'll go rent the first one just to unlock the extra costume filters. Does it matter how far you've progressed in the first one?[/QUOTE]
I'd say save yourself the money and don't even bother to unlock the two filters. They look terrible. Make sure you take a look on the Internet first to see if you really think it'd be worth your money.