Actually I believe that is KR Fifteen in Gaim arms, not Bujn Gaim. And yes I think he is kicking him there.
And the Ninjasaurus has been Ninja'd.

It is. The Heisei Rider lock allows someone to access Gaim Arms. Which is based on Gaim's default Orange Arms. It shouldn't be confused with Orange or Blood at all. Likewise the Showa Rider lock gives someone access to Rider 1 (Ichigo) Arms.

I think it's safe to say at this point we could be looking at a new Legend Rider Arms Change 4 -pack. As of now we have in this film:

Decade Arms
Gaim Arms
Ichigo Arms
Kamen Rider Fifteen. Presumably his arms is Fifteen Arms.

We could possibly see a big DX AC pack that includes Fifteens base rider form with his personal arms and the other 3 Legend Rider arms included.

Aren't there also Wizard Arms?

Yeah but those came out in the last movie. They aren't new. I'm just talking about the new arms created for this movie.

The last movie had:
W
OOO
Fourze
Wizard

Now we have:
Rider 1
Decade
Gaim
Fifteen

Ah yes. They aren't a new design.

No kidding.

Pretty excited.

I still think the original 4 suits are the best in design, while the other Sengoku Riders are pretty decent, and the Energy Riders look like they tried too hard to make them look good. Zangetsu-Shin is decent, but the other 3 riders look terrible and actually had potential to look good. It's fine by me, because it just means that I won't have to buy more Figuarts.

I wouldn't assume that vanilla Zangetsu will disappear, maybe the Energy Riders will disappear from the show and focus on the Sengoku Riders near the end. I'm basing this assumption on whether or not the Rider War will happen.

Yeah, I quite dig the design.

I think what I don't like about the Energy Riders, is they no longer look like fruit and more like brightly coloured warriors. Somehow keeping the fruit influence obvious - and drawing attention to the fact - in the Beat Rider armours, actually helped anchor and balance all the goofy details and bright colours while not detracting from the badass looks.

But then because the Energy Rider's are only really advertised as BADASS and the fruit theme is toned down so much, it seems somehow more stupid how brightly coloured and generally goofy looking they are.

Ya the chances of Zangetsu returning, is extremly slim, next to impossible basically.