[Kurona]

It turns out the artbook contains concepts for not just Zeo Gold and Mystic Force White, but also Time Force Pink and Black Dragon Trini. This is... interesting.

It could be that they're in the game as unlockables and Nway just hasn't communicated that to us - they are legendarily bad at communication, so I wouldn't put it past them - and it could be that they're DLC or were cut due to pushing the game's release date forward. Either way those 4 characters don't match up with how DLC is supposed to have 3 characters, so it does stick out as odd. I guess we'll find out tomorrow if any of them are still in the game....