There was an upgrade in the economic assessment by the BOJ and comments from governor Fukui. From that point of view an end to the zero interest rate policy is coming closer.
Today's decision means the end of zero interest rate policy is coming closer. Less liquidity is available for yen carry trades and that should be positive for the yen.
The main reason for the yen's strength is the data we got overnight -- it suggests deflation is coming to an end.