With us just now getting actual suit scans of Kachidoki who will, unless i missed an episode announcement which is entirely possible, then Kachidoki will be a mid to late 20's episode at the latest then the next form might be a mid to late 30's ep with the other 3 Jinba some where between now and then.

But this show is a fantastic toy sink-hole and another form is entirely possible, but after a lock/key combo of almost all the other fruits i don't see where they can go other than an Apple Arms or going with the twists this show throws at us i wouldn't be surprised if his last form was an Invess =D