So yes, a second Cinder Kamen rider, this time taking the aspect of being a Maiden, which is basically a magical girl, as well as her Grimm arm as inspiration.

Cinder Fall: Kamen rider Amber
Her form will be a combination of the Mage, with the large monster hand which will be more like Cinders grimm arm, a helmet similar to Wiseman's helmet, and a suit similar to a combination of Wizards base form and those leg things on Junketsu when worn by Ryuko and Junketsu in inactive state (Kill La Kill).
Her base form name is Kamen rider Amber: Autumn Style. As a tribute to Amber Autumn, the previous Fall maiden, as a way to keep her alive, and as a form of mental support after Cinder chose to redeem herself.

Motif: Amber, Obsidian, maiden, monster, redemption, rings.

Transformation Jingle
"Autumn, PLEASE~: AKI~AKI~, AKI~AKI~!"
Her gemstone motif is a Amber+Obsidian style.