In South Africa, a white Thoroughbred colt was born in September last year on a racehorse farm called Rathmor Stud. They also bred Graham Motion's Gypsy's Warning. He has been named Gran Blanco, both parents are bay, his grandsire is Rakeen, a half-brother to Rahy. Apparently he is the first of his kind in South Africa. Click on these two links to see him: KZN Breeders : Gran Blanco Update From Rathmor Stud
And then I also found this, the stud's website itself with pedigree and pics: Rathmor Stud: Thoroughbred Foals - Gran Blanco
I think there is a Japanese White TB racing called Marshmellow, this little guy is going to attract attention when he starts racing.