StreetFighter IV's official blog post says that, Shizowa san announced that Sakura
has a new face 3d model since the tgs trailer and also Chun-li will also have a new face model for the home version. Seems fans are not content with the arcade look so they changed her face. In the right side is the latest appearance of Sakura again, her face was altered a bit on the eyes and chin area. Seen below is her first TGS '08 appearance.
Google translated source: sf4 blog