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Random thought, I wonder if they'll possibly try to rotate some of the riders in and out over the course of the show like they did in Hibiki.

For instance, we'd focus on the main trio for most of the show, but every now and then another rider like Kenzan or the unnamed 5th one would stop by and hang out with the group for a few episodes.

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As for the riders themselves...

I actually like most of their designs. A random person on twitter pointed out that the dragon on Saber's shoulder looks a little too much like Guilmon from Digimon, and honestly I can't say the resemblance is unfounded...

Blades/Blaze/Blazu looks nice, although the "Black|Blue|Black" color scheme looks plain, same with Espada's "White|White|Yellow" design.

Kenzan and the unnamed 5th one look alright, although I'm more excited to see the 5th one in combat. As I can't really recall when was the last time we had a heavy armored sword wielder aside from Kuuga Titan, Gaim Kachidoki, and like Sasword in Masked Form.