Turns out this is from ep 27, the final battle against Bodolza (wasn't this originally supposed to be the "final" episode?). The fast packs are definitely supposed to be blue/red, but the white is open to interpretation I suppose. When the valkyries are first shown, Milia has the white parts, but then in a heavier action sequence, the entirety of the fast packs are red/blue. I would say this is the "lazy cel coloring" part. Then when they are in focus again in battroid mode, the white is there again. In ep 30 the fast packs are all the standard grey colors throughout the episode. Regardless, I think it looks great, can't wait!