Please be a sequel to Shin. I would love to see how Anno would handle V3 and Ridderman.

If it's a live-action Tojima Wanna Be a Kamen Rider, LFG. :rock:

Part of me wonders if this'll be related to anything that the smaller series like Outsiders and Girls Remix have been doing. Although, if you ask me I'd want something that's like a new Showa era kind of film.

Recently, I watched a documentary about Gaia and I'd love to see something that's more Showa-esque, because I really loved ZO.

This is just my personal speculation, but I feel like Toei wouldn't be having a countdown if it were a tie-in to a TTFC project. Those are strictly for the diehard fans, and a publicity stunt like this is meant to draw in attention from casual audiences. Especially since this is being produced for the anniversary.

I think it's either going to be something related to the original series like Shin Kamen Rider 2 or possibly even an entirely new standalone Rider. It could also be a sequel to a popular series if they were able to bring back the cast, but those have typically been reserved for V-Cinext. It'd have to be something major like bringing back Takeru Satoh, Jo Odagiri, or Masaki Suda in order for it justify a full theatrical release.

They opened up a Poll on the site for people to pick from 11 titles to guess what the Project will be:

Disclaimer: Some of the Movie have their titles solely in Japanese, but here's what I got.

1. Agito
2. Ryuki
3. Kabuto: 20th
4. Den-O
5. Decade
6. Gaim
7. Ghost
8. Amazons Psychic War
9. Ex-Aid
10. Build: Be The Two
11. Zi-O Next New World

If I may add to this, the additional titles seem to be (excluding what you already wrote):
Agito: Chonoryoku Senso (Psychic War)
Ryuki: Survive Grand Prix
Kabuto: Ten wo Tsunagu Mono (The Successor to Providence)
Den-O: Ore, Enjyo (I am Ablaze)
Decade: Cho Shocker Taisen (Super Great Shocker War)
Gaim: Niflheim War
Ghost: Shunen! Hajimari no Eyecon! (Anniversary! Eyecon of the Beginning!)
Ex-Aid: Divine Game

Considering all the word going around about potential Kabuto 20th filming alongside Kabuto being the only one to have the anniversary moniker and a lot of these titles genuinely being funny than serious (Be The Two lmao) I feel like it's Kabuto that's the real one.

If it is Kabuto I would LOVE to see a new rider, hopefully based on a flying cockroach hahaha

Will they get Hiro Mizushima back, have Kagami be the protagonist, or a new Kabuto (successor to providence?).

I'll just turn my suspicions up to maximum and assume that the anniversary Kabuto was specifically added to distract attention from the real hero.