Nokia's Advertisement criticized the lack of color of the iPhone and how color was stressed in the new Lumia's.
I find it hard to believe that Apple does not focus on color.
1. Case. If you want color, get a case. It'll add thickness, but chances are, it'll still be thinner than the 920. (Not that thickness is a bad thing).
2. Apple doesn't stress color? Seriously?
And (Product) Red...
And even back to their iMacs and iBooks
I would say that Apple knows quite a bit about color.