With Japan (and S Korea) discussing the strong dollar with the US, the intervention threat stays on the table. This suggests tacit approval should Japan choose to intervene on its own.
However, given the fundamentals (i.e. interest rates) and a generally strong USD, intervention would likely be a questionable strategy and seen as a stopgap.
With that said, it pays to be on alert after the IMF/World Bank meetings end.
Lookjing at the chart, the current range is 153.87-154.77 but 155 is clearly the market line in the sand,