I wrote this post Potato Chips Japan long long time ago. In that post, the pupular flavors were consomme, light salt, nori-salt, butter. Those ranking won't be changed even now in 2016. And also Japanese unique flavors seem no change. There are wasabi, soy sauce, and yuzu pepper in calbee which is the biggest potato chips maker in Japan.
On the other hands, second position maker Koikeya's merchandise strategy is more aggressive :-). Since last year, they push potato chips for breakfast. in 2015 Last they released Banana potato chips and Peach potato chips as morning fruits. They has very sweet smell and reputation on the internet was so so. Despite of that, Koikeya has released another morning potato chips again. Those are toast potato chips and Milk potato chips. I didn't try it yet, but some said those are not bad at all, toast flavor is nothing wrong and milk flavor is taste like thin cookies. Hmm I won't need them though.