When Tamar talked about the mailing version of Kit Kat in Japan, I knew there were other versions of Kit Kats in Japan, and a quick google search showed that I wasn’t wrong… and check out the list on wikipedia!!
This makes me wonder how much money has been put into market research and internal lab research to discover these flavors and apply them tastefully to a Kit Kat bar. But however much cost that is, clearly, the revenue outweigh the costs because they are probably still looking for more flavors!