Just a quick note encouraging you to check out fellow Kit Kat blogger haikugirl at My Kit Kats. She has several varieties of Kit Kat I haven't tried including Kit Kat ice cream, Kit Kat in yogurt, and a Kit Kat branded daruma.
Because they have all kinds of crazy flavors in Japan, that's why. From Japanese Green Tea flavored ones to Rose, Peach, and Apple Vinegar, there is a cornucopia of Kit Kat flavors to try here. And I'm going to try as many as I can.
If you're also searching for Kits Kats high and wide, read my post Where to Find Kit Kats for tips on where to shop online and in Japan.