On the 4th April the BoJ outlined said they have set a price stability target of 2% to be achieved within about two years and this will be achieved through quantitative and qualitative monetary easing measures. The BoJ will double over the next two years the monetary base and the amounts outstanding of Japanese government bonds (JGBs) as well as exchange-traded funds (EFTs) and they will also more than double the average remaining maturity of JGB purchases. The Bank has said it will continue with the easing measures for a long as it is necessary to maintain this 2% target in a stable manner.  

Link:
http://www.boj.or.jp/en/announcements/release_2013/k130404a.pdf