They played a couple of recreated samples on NPR. One sounded roughly pentatonic to me; the other sounded... of indeterminate scale and/or out of tune. It's hard to say exactly how it would have sounded, because the flute allows a lot of room for bending the pitch based on things like embouchure and whatnot (I'm a former flutist).
Check it out for yourself:
http://www.npr.org/templates/story/story.php?storyId=1058231...