Snows and marketed leucistics are not always white. I bought a baby marketed leucistic which is sometimes called a snow. Basically these are hypomelanistic dragons with clear nails. They are supposed to get lighter patterned and less color with each shed, but mine actually has a lot of peach on him and he was hatched April 14,09.
His parents are both beautiful white dragons. You are just going to have to wait and see how he turns out. Most get very white, but some, no matter how light the parents get, don't quite loose all the color. At your baby's age he is probably more tan with either a litte yellow or a little peach and when he is stressed he will probably be an almost ugly shade of brownish. That's normal when they are young. I was assured by the breeder that this is normal and just to be patient.
There is no such thing as a true leucistic bearded dragon to this point in time. They are all hypomelanistic dragons with very light shading and they are sold as marketed leucistics and sometimes snow dragons. To this point I haven't had a breeder be able to explain any genetic difference between a snow and a marketed leucistic.
Here is Ash he is 14 inches and weighs 120 grams and is 3 months old.
