Beautiful! I love ones like this with thin white borders around the masks or waterfalls. Makes them look like neon signs or glow like lightning.
As to the genus, we all know it is Miltoniopsis, but growers don't want to change their tags because of cost and except for orchid enthusiasts like us the public doesn't really care. I'm inventorying the Smithsonian's orchid collection this summer and we just decided to go through all the hybrids to separate the ones that truly have only Miltoniopsis in their breeding. These plants WILL be relabelled as Miltoniopsis hybrids, not Miltonia hybrids as they are now. The Royal Horticultural Society's International Orchid Register also lists them as Miltoniopsis hybrids. In the rare case that a hybrid has both Miltonia and Miltoniopsis species in it's breeding, they are now called Milmiltonias.
And Rosie, you're right. The distinction is important for cultural purposes, as Miltoniopsis species are from Colombia and prefer cooler conditions than Miltonia species, which are from Brazil.