Namco Bandai has filed a trademark for Soul Calibur: Unbreakable Soul.
While it could be a new entry in the weapon-based fighting series, the trademark covers everything from "printed circuit boards for video game machines", "cards" and "discs" to "movies", "musical performances" and "television programs". It may be that Soul Calibur Unbreakable Soul is a tie-in product rather than a new game.
In September, Namco Bandai revealed Soul Calibur: Lost Swords, a free-to-play entry in the Soul Calibur series in development exclusively for PS3.
Soul Calibur has become the second of the company's major fighting game franchises to move into the free-to-play space following the release of Tekken Revolution.
Namco Bandai is also developing a HD port of its PS2-era classic, Soul Calibur 2. The port's fresh visuals will be accompanied by a brand new online mode that lets players face off online.