Recently Siegfried was announced as another character for Soul Calibur 6.
Here is the official description of Siegfried:
After losing to Kilik and his comrades as Nightmare, Siegfried wakes up in an unfamiliar place. Siegfried is unable to free himself from the merciless memories of the time he spent as the puppet of the cursed sword. The memory of him killing his father haunts him. His real nightmare has just begun. full of regret, he seeks redemption and desperately wants to free himself from the clutches of the cursed sword.
As soon as there is more information about the game, we will let you know as usual.
Soul Calibur is not possible without Siegfried. We are already looking forward to the release. Soul Calibur 6 seems to be on the right track.