User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-3298463-20111215132528/@comment-3062343-20111215195712

White Nargacuga wouldn't surprise me at all. The Nargacuga concept art in the Monster Hunter Illustrations book even says someting about there being a small population of white variants, along with blue and palomino. So I'm guessing if it is one of those, white would be the most likely, since Narga's icon is blue already, making it hard to distinguish, and Green Narga already looks slightly golden in colour.