Soulcalibur 4
This massive weapons based fighter is returning to PS3 and 360 as a solid sequel next year. Nightmare and Seigfried will now be two different characters. Ivy, Taki, Yoshimitsu, Mitsurugi and Tira have been scheduled to re-appear as playable characters. Also, there might be a possibility that Star Wars character might make an appearance as stated in the newest issue of EGM with the Soulcalibur headline story.
As for the Wii, it'll be getting a different version called Soulcalibur Legends. It's a full on adventure game which allows you to choose a few characters such as Ivy and Taki. You take on several identical bad guys ala double dragon and focus on reaching a goal.