Look into the link, there are for example :
Kit Kat Iced Tea — Japan
Kit Kat Caramel and Salt — Japan
Kit Kat Kinako (soybean flour) — Japan
Kit Kat Wa Guri (Chestnut flavour) — Japan
Kit Kat Green Tea — Japan
Kit Kat Zunda - mashed edamame beans; Japan (only in Yamagata prefecture)
Kit Kat Hascapp - Hokkaido blueberry; Japan (only in Hokkaido prefecture)
Kit Kat Soy Sauce - "Tokyo Limited Edition" ; Japan
Kit Kat Yakimorokoshi - grilled corn; Japan (only in Hokkaido prefecture)
Kit Kat Jyagaimo - potato; Japan (only in Hokkaido prefecture)
Kit Kat Daigakuimo - candied sweet potato; Japan
Kit Kat Kobe pudding - "Kobe Limited Edition" ; Japan
Kit Kat Houjicha - Japanese roasted tea ; Japan
Kit Kat Kokuto - Black sugar ; Japan
Kit Kat Watermelon and Salt ; Japan
Kit Kat Pumpkin ; Japan
Kit Kat Edamame (Soybean) ; Japan
Whereas ours are rather unimaginatively varied by size, or by other usual features found in other chocolate bars e.g. mint flavour, caramel added, dark or white chocolate varieties etc.