Quote from Hayek:
Currencies are still dominated by interests.
US has at least 3 times 25bps rate hikes (one already in Jan 31).
Eurozone is likely to have the same amount of rate hikes as well in 2006.
Japan is going to end its "quantitative monetary easing policy", but the first step will be very prudent. By the end of 2006, the interests spread of Fed and BOJ may even be a little bit larger than now. While BOJ's rate hike will definitely hurt carry trade, its influence in 2006 can be small. Actually I think recent Yen strength due to speculating on BOJ policy change will be short term and will not lockup USD/JPY below 110 at the end of the year.
And no expectation for other major central banks to change key rates largely.
So it seems it is hard for big players in currency market to find a convincible excuse make others follow the trend they may build in 2006.