This Week The Femme Fatale costume pack is out this week for US. This add-on has alternate costumes for all the female characters in Street Fighter IV.
With this add-on Chun-Li wears a Chinese dress. Cammy gets a lons-sleeve sweater type thing. C. Viper has a midriff baring version of he origional gear. Rose looks even more of a psychic with her new costume. And for the first time Sakura sports some shoto gear to go with her moves.
I found a YouTube video that shows the alternate outfits. Enjoy, everyone!