If you were planning on pre-ordering Super Street Fighter IV, Capcom is offering some incentives. Best Buy and Amazon customers get timed exclusive costumes, including a super awesome Kato outfit for Fei Long that is full of nostalgic Bruce Lee win. Gamestop gets the short end with some thumb covers used for thumb wrestling, featuring Street Fighter characters. That is nowhere near the awesomeness of the Kato outfit.
For those in Europe, there are choices, but there has been no specification which retailer will get what. The costumes will be offered, along with some iPhone covers and t-shirts designed around the fighters costumes. Capcom has an extra three days to figure it out, because the European release is not until April 30th, three days after the US release.