Ahead of the Bank of Japan's (BOJ) policy review meeting on Thursday, analysts are busy predicting what further stimulus it could announce and how that could affect the Japanese yen.

"We believe that the BoJ will ease further on Thursday, an event to which we attach a probability of about 65 percent. We expect a powerful package of 20 trillion yen increased quantitative easing purchases and a cut in the interest on excess reserve rate of 20 basis points to -0.30 percent. The BoJ is also likely to apply a negative rate on its lending facility." UBS said in a preview statement.