From the vietnamese fb leaker
>A few descriptions of Kamen Rider Zeztz's first Power Up Form and the dark warrior appearing around the middle of the show.
>>Kamen Rider Zeztz Power Up Form (tentative name): uses the Inazuma Capsem with a dominant golden yellow color and an overall silver-gray body, not much different from the Base Form.
>>This form is equipped with a bow-type weapon that can combine with the Zeztz Breaker.
Additionally, there is a Capsem, tentatively called Booster, which adds some titanium-colored details to the neck, face, and both arms of this form.
>>Dark Hero (tentative name): it is not yet clear if this is a Rider, but still uses a diagonally worn Driver, with asymmetrical arm design language similar to Nightmare; one arm is quite large and mechanical, and the shoulder is rounded like a Capsem.
Has any of the usual Chinese leakers commented on this?