‘Otoshidama’ (お年玉) is a an envelope containing money given to children by their elders at New year in Japan. This year Kit Kat has made an Otoshidama Kit Kat:
The box has an envelope on the back of it for the money.
As it is the year of the sheep, the Kit Kats and box are decorated with cute sheep!
The gold Kit Kat says it is a rare golden package (I’m sure there’s one in every box!) and that perhaps this year something good will happen! (レアなゴールデンパッケージ 今年いいことあるかも？！).