I think the Gaim Kiwami Arms and Drive Type Tridoron will be summons from Grand Zi-O, since it's pretty much Decade Complete form and Diend's summon cards on steroids.

I have a feeling this movie exclusive form may end up being used to represent Zi-O's final form in future Rider media, similar to how Super TaToBa is frequently used in place of OOO's actual final form.

Super TaToBa was used once, and it was dumb. Everything else - aside from HGF going with Tajador - uses Putotyra.

I mean, that same episode also had Momotaros in Liner Form and Decade using the Strongest Complete form.

Could always just kitbash a new one. Though they can't take the 'paint it gold' approach they did with W and Wizard.

Super TaToBa also was used in Movie Wars Ultimatum, and then OOO never used a final form again until Heisei Generations Final. The main issue is that many directors don't seem to care about form changes in general for past Riders (form change for the sake of form change/powering up, rather than toy advertisement) and so movie forms would be a level bellow that.

It's pretty much only Shibasaki and Sakamoto that seem to just enjoy allowing the Riders to use form changes and acknowledge movie forms (also Hidenori Ishida in Wizard's finale, but it's hard to tell since he didn't direct any other crossovers).

Putotyra actually hasn't been used as the "final" form in any of OOO's post series appearances so far though, only in games and merchandising. Putotyra was used in SHT, Ultimatum and Wizard's finale, but as a standard form change (with Super Tatoba being the final form in the later two, and no final form used in SHT). This movie might be the first time it's actually used as OOO's final form in a post-series movie.

Can anyone with a better understanding of Japanese translate this?

http://i.imgur.com/frXYXEe.jpg

The Another Ridewatch set 3 featured 7 Another Riders up till Another Hibiki, so it can be assumed set 4 will contain Kiva, Kabuto, and possibly Another Drive and Another Decade, and at least one more Another Rider since these sets have at least 5 pieces.

Left:
Kamen Rider W Cyclone Joker Extreme
Kamen Rider Faiz Blaster Form
Kamen Rider Den-O Liner Form
Kamen Rider Genm Zombie Gamer Level X
Kamen Rider Drive Type Trideron
Kamen Rider Decade Complete Form
Kamen Rider Kuuga Ultimate Form
Kamen Rider Skull
Ankh
Kamen Rider Zamonas
Kamen Rider Orga
Kamen Rider Blade King Form
Kamen Rider Wizard Infinity Style
Kamen Rider Ghost Mugen Damashii
Kamen Rider Agito Shining Form
Kamen Rider Meteor
Kamen Rider OOO Putotyra Combo
Kamen Rider 3
Kamen Rider Eternal
Kamen Rider Dark Drive
Kamen Rider Kiva Emperor Form
Kamen Rider Kabuto Hyper Form

Center
Kamen Rider Hibiki Armed
Kamen Rider G3-X
Kamen Rider Ryugen
Kamen Rider Beast

Right
Kamen Rider IXA Burst Mode
Kamen Rider Build Genius Form
Kamen Rider Zonjhis
Kamen Rider Zolda
Kamen ider Balrx
Kamen Rider Ex-Aid Muteki Gamer
Kamen Gaim Kiwami Arms
Kamen Rider Grease
Kamen Rider Poppy
Kamen Rider Mach
Kamen Rider Caucasus
Kame Rider Ryuki Survive
Kamen Rider Baron
Kamen Rider Fourze Cosmic States
Kamen Rider Birth

Another Ryuki? We got Ryuga in the mirror world set, but I don't believe we ever got Ryuki

I don't think we will get to see another decade because the Time Jackers do not know of Decade's rider powers origin. Unless some Bullsh*t happens like with another Kikai, it's unlikely that will happen