UPDATE 28th September 2020: As expected, Bandai Namco has announced Kunimitsu as a DLC character for Tekken 7, alongside a roadmap for the game.
Tekken 7's Kunimitsu is in fact the daughter of the Kunimitsu whose last canonical appearance was 25 years ago in Tekken 2. This new Kunimitsu happily throws off her mask - something her mother never did. We also see her face off against fellow ninja Yoshimitsu in the new Vermilion Gates stage - and steal his Manji blade. He seems upset!
Season Pass 4 gets you Kunimitsu and the new Vermilion Gates stage this autumn. Then, in early spring 2021, there's a new DLC character and stage.