Yes in the Swiss dairy breeds it's very unusual to get anything other than the standard colours. Roans are lovely, but very, very rare. I know someone who has a nice one, and we have a (nearly) British Saanen crossed with a British Toggenburg who is roan. But she's not a nice roan- not the distincive colour, but instead she just looks like she's a grubby shade of white! In the winter she gets dark patches under her eyes when she has her winter coat.
Beth