Apparently Kit Kats are popular in Japan. They come in boxes and are packed by 2 sticks in 2 wrappers inside. So far I have found 6 flavors. I keep looking for more flavors...
Regular:

Normal, Just like America
Green Tea:

Yummy, just like what you would expect. Green chocolate outside, white wafer inside.
Apple Vinegar:

A bit strange. Apple flavor with a bit of extra tang. White outside.
White Chocolate:

Expresso Coffee:

Kinako (Toasted Soy Bean Flour):

Tasty. It doesn't really taste like Soy, more sugar and maybe a little peanut butterish, hard to describe.
I just googled KitKats and crap there are/have been a ton of flavors in Japan.
Check it out.