[Tokumonkey]

Toy listings are up on Tokullectibles, and although I may be misreading it, it looks like there's another character, Kamen Rider Valen, who uses a henshin gun and the Chocodon gochizo, so likely a two-gun Western theme given the Gavv ChocoDon form. I'm guessing this is a rival, but there's no way to know until they release more information. They're being released as separate action figures in the retail line, with cross-compatibility, so Valen comes with bits for Gavv to use in the form.

Also looks like a new form (my best guess: the first super-form, also likely to get ignored in favor of a Q2 upgrade), for Gavv called CaKing. Cake, maybe?