Street Fighter V is releasing its extra fighters as DLC post launch for the past few months such as Alex but a new fighter joins the ring; Ibuki comes to Street Fighter V!

This character is a fan requested one after her appearance in Super Street Fighter IV, so her returning to SFV is nice to see. More characters are coming to the game after her, so we will cover them when they are announced.
Update: Capcom Japan announced that Ibuki will be releasing alongside the story mode in June’s big update, rather than sometime in May. This comes to light for Capcom Japan and NeoGaf Member Ryce.
Source: http://www.neogaf.com/forum/showthread.php?t=1225456