Every single returning Soulcalibur VI character so far has leaked early and Cervantes is no exception. Bandai Namco has decided to stop holding the door closed despite everyone knowing Cervantes is behind it and has released a trailer for the undead pirate's appearance in Soulcalibur VI.
Cervantes is one of the former wielders of the evil Soul Edge, which has given him everlasting life, though that matters less in a reboot. Cervantes is not DLC and will be included in the base roster of the game, making Tira the only announced DLC character so far. Judging from the initial leak that revealed Cervantes, it seems likely Raphael is due to be revealed next.
Soulcalibur VI releases on October 19 for PlayStation 4, Xbox One, and PC.