According to this user, they announced Saber/Zero-One team-up Movie.

I guess we won’t be getting Zero-One Summer Movie after all. :(

Blaze looks cool, but Saber still does nothing for me. However, I'm eager to see how insane his final form will be since his base form is already pretty elaborate.

Actually, it isn't really breaking tradition. Thes are the traditional bug eyes. It also has the typical horn.

The part where they get a bit more creative is the gem on the forehead which seems to be the white blade slashes and I live that! It's so creative.

Info I picked up from the scans and other places here and there

- Using the Brave Dragon WonderRide Book Saber can transform into Kamen Rider Saber Brave Dragon
- Saber's sword is the Kaenken Rekka(Flame Sword Wildfire), a sword of fire
-Saber's rider kick is the Dragon Issatsugeki Fire(issatsugeki is a combination of the words "one", "book", and "attack")

- Using the Lion Senki WonderRide Book Blaze can transform into Kamen Rider Saber Lion Senki
- He is senior to Saber
- Blaze's sword is a sword of water called Suiseiken Nagashi(Water Potential Sword Flowing Water), and can perform a finishing move with it called Hydro Stream
- Blaze's rider kick is a dropkick called Leo Cascade

- The enemy are otherworldly monsters that have entered the human world to destroy it
- The markings seen on the soles and belt are called Ridermoji(moji means letter as in a, b, c)
- The swordriver's three slots are for three different types of WonderRide Books, To the belt-wearer's right are for WonderRide Books on Mythical beasts, the center for those about actual animals, and the left is for WonderRide Books on stories

Oh wow got it wrong again lol
This is more like ooo split but they do it horizontally rather than vertically
Also the belt have 3 "books" slots...

Divine creatures? Sacred animals? Whats the difference? Lol - it would make more sense if they used legendary characters like robin hood or arthur for the "middle book"

Maybe its kinda early to judge - but it looks like the reiwa riders are going for an overlapping multi kinda fusion like zero one (base + base animal grasshopper + any other animal) compare to the heisei ones like ooo or double, something like that

Wierdest rider so far for me

Divine Creatures and Sacred Animals can have differences like separating what is say...the World Turtle or Phoenix, divine creatures, from sacred animals, like dragons or unicorns. Doesn't seem like there's much of a difference but it does make sense if you divide mythical creatures into categories like that.

I love that the boot design has scriptures on the sole. It's a nice touch.

Okay I'm really digging these two a lot, seeing the full Saber suit really makes me like it a lot.

Also Blaze just well has a Lion Chest, and as we've seen countless times in the Brave Series, Lion Chests are cool.

Came here to say just that!

I'm trying to figure out how the gimmicks might work toy-wise though. My current guess is that RideBooks with have sounds in them, and *possibly* LEDs behind the "pages". Meanwhile the sword will have its own sounds and lights, that play regardless of what's in the belt. The belt itself I don't think has any electronics, just possibly some switches and stuff to trigger the books & any upgrade attachments at the right times.
Presumably the different Riders' swords have their own sets of sounds to distinguish them, but I don't think the swords will ever "know" what books are inserted, or vice versa. Closest comparison I can think of is the Books are like lockseeds, and the Swords are like faceplates (if it was the faceplates themselves making the sounds!). Saber's and Brave's swords are pretty similar; I'm really curious to see if we get any different looking ones later down the line.

I'm super unsure about precisely how the sounds will work though; with three slots, they've surely got to leave enough space for each book to have its turn saying something, which would just lead to a lot of awkward silence (or standby music) when a rider's just using one book! Hopefully between a press conference preview of the transformation (if we're lucky) and the early release of Peter, we'll soon get a better idea!

its rare to see a lion in blue color and associated it with water. Usually its warm colours like red, orange or yellow that symbolised high energy, passion, fiery temperamental nature, etc
They could have use cetus or hydra for the base creature
I really dont think they do enough exploring for mythical creatures....sigh

Oh well, it is what it is...^_^

I mean from what we've seen it seems like Lion is just a normal animal. Since it's not in the mythical creature slot like Dragon is. Given it goes Mythical Creature, Normal Animal, Fable.