Well, I just repotted and mine have it as well except mine are white in spots. Its not as clear as yours but there were two roots next to each other on the bottom of the pot and one was white while the other was green. Very cool stuff!
Wait until you see the inflorescence. It should be variegated as well!
Very, very cute. I just love the variegated foliage! I have a variegated form of Phal. Little Gem myself, but it's nowhere near as variegated as yours! And it's a big Phal, not an adorable miniature one like the Sogo Vivien... But I like it anyway.
But wow... I understand why you're so glad you won it.