Rumors do state that Saber has all the Seiken on his head like a crown. So, I'd imagine gold is in the color scheme but maybe not as a primary color, but the rumor does also state that the form silhouette is "a simple style". So, kinda like Zero-Two? Honestly, if simple final forms are the way to go for Reiwa, I'm all for it.

HHHmmm I would like to see green or cerulean as an accent color used more like MCH in Zero-One. I'm def tired of silver or gold as the base/main color in final forms too but don't mind them as accent colors. As outrageous of a color palette Primitive Elemental is I feel Saber's final form color scheme should be more grounded with only the accent colors popping out.