Probably not. Koodo loves trying to cut costs on device selection by limiting color selection. It's sad, really. It's been going on for years, and every once in a while they surprise us, but most of the time you can just expect black.
I'm not saying they have to order a lot of white phones, but at least have some available. When I worked at Mobile Shop, sometimes if a new customer came in and was deciding between Koodo/Fido/Virgin and there was a phone available on more than 1 of them available in white that Koodo didn't carry, they would choose the other carrier simply because they had the different color phone.
the Canadian Motorola site only list black as an option so even if koodo wanted to, it might not be available in Canada. the US site however, has motomaker that allow to to customize your G4+ and order it in a bunch of different colours. they don't ship to Canada though