Please forgive me for any errors because I don't have my deck or book on me right now.
I've been thinking about the androgynous characters. I think the androgyny ties in with the coloration to remind us that these are symbols, not precisely people per se. It's a lot harder with this deck than with some to look at a card and say, "hey, that looks like my friend Dave!" or whatever. That kind of association can be good, especially for beginners, because when you draw that card you can think of Dave and immediately have a set of associations. But this isn't a deck for beginners, and that kind of association can also be highly limiting...if you can't get beyond the image of Dave, then you will have a hard time associating this card with attributes that don't necessarily belong to Dave. It's interesting in this vein that the court cards are colored much more realistically, and also have defined gender. It's almost begging you to read courts more literally as people in your life, and the majors and pips as symbols or events that may or may not have to do with real human beings, if that makes any sense.
It's so hard not to assign gender when you're looking at the cards. For example, I did a reading recently in which (I believe) the four of wands came up (I wish I could find a picture of this card online, but a cursory search reveals nothing. Does anyone know of a good site with scans?). It's difficult to say why, but of the two figures on the card, I immediately saw one as female and the other as male, despite their, er, lack of definition. Gender in human societies is defined by so much more than genitalia; it's in body shape and type, basic movements and carriage of the body, not to mention actions. In that sense it's almost impossible to draw people of neither gender, and I'm not sure Ms. Turk was trying to do precisely that.
When you see a card containing a figure that appears feminine but has no breasts or other seemingly defining features, can you say, "This is a woman, and the fact that it's a woman means x"? Or do you try to get around your possibly limiting stereotypes? What would it mean if it were a man in that exact position? Who says it isn't anyway? How would you react differently?
It's interesting to see the attitudes toward gender that this teases out.