Look at it this way. About a year ago, due to the depreciation of the yen, prices dropped by about 20%. Since then, the yen is up about 20% and so is it surprising?
Yes, Japan is suffering a real drop in their manufacturing and are suffering. But the problem they have is that many of thier investment funds are pulling back from Europe, UK, US, and everywhere else and hence there is a demand for yen. This is definitely not helping the country. Yes, at the end of the day, the banking sector is causing this yen appreciation, which is not what the manufacturing sector wants. But it they keep dropping prices (in yen terms), they can't survive - in the long term. And with production already reduced (i think they tried the keep prices down strategy for a few months now) they have no other alternative.... really.
But wait, the yen is starting to come off as it will reach a stage when Japan banks and investment funds have less funds to pull back to Japan and if the flows start reversing, we may see a 10% drop in the Yen. That, plus a need to try to increase demand, may see the Jap companies dropping prices, but time will tell.
Everytime prices go up, people (esp here in Singapore) react emotionally rather than thinking through logically what is happening.