For those Japanese iOS owners who have a yen for buying paid apps (pun intended), it actually is the volatility of the Yen that is forcing Apple to raise the price of paid apps in Japan; Apple monitors the forex market, looking to even out dramatic moves amongst currencies. While Apple did not specify the size of the increase, developers can view the new Pricing Matrix on iTunes connect...
Source: http://www.phonearena.com/news/Apple-to-raise-App-Store-prices-in-Japan-today_id48376
Source: http://www.phonearena.com/news/Apple-to-raise-App-Store-prices-in-Japan-today_id48376