The following is a rumor, please take with many grains of salt:
-Wizard's world is like Hibiki's, there are many Mahoutsukai all over
the world. 5 are set to appear within the course of Wizard's story.
-Wizard will have 2 Final Forms, whose rings seem to be "Adamantite and
Orichalum" (2 Mythical/Legendary metals.) The rings are set on a Knuckle
device. The Knuckle can become a MachineGun, and a Cannon.
-The 2nd Rider will be Kamen Rider Witch, the first female secondary
rider. Witch is like Wizard, but has a Witch's hat-type helmet, and her
jewelery is "clear" colored. She has a Broom-styled Halberd as her
weapon, which can turn into a Sniper Rifle. She transforms/Form Changes
by setting clear jewelery onto her neckless.
-The 3rd Rider, currently nameless, will have a "Japanese
Magician/Diviner" motif. His head is shaped like Fourze's. Has a
"Summoner Form" and a "Samurai Form." Samurai Form can move at
incredible speed, but can only be maintained for a short period of time.
Summoner Form can summon Phantoms that Samurai Form has defeated and
let the Rider control them.
-The Wizard Summer movie will detail the unknown portion of Wizard's
training from his Master, and the first time he transforms. It will also
be the first appearance of his Final Forms and Rider # 3.