Yes, there are no guarantees. I suggest you check out the three I said and see what you think of their dogs. Contact the breeders themselves and talk to them. I have more WGSL breeders on my own list who I believe are trustworthy, reputable breeders with good-looking dogs. But in a litter, you simply can't tell for sure at 8 weeks which pups will keep the black face/dark mask. You also can't guarantee the parents will produce a pup with one.
And, even if they do, most of the really good breeders choose your puppy for you based on which one is best for your lifestyle and will thrive with you the most.
I'm not trying to discourage you, I would LOVE for my next pup (who I'll be getting by the end of the year hopefully) to have a black face. But I know it's not a guarantee so I'm just going with a good breeder, with dogs I like the looks of and hoping for the best. (:
Mom To~ Dakoda (b/t GSD), Acheron (black GSD)