I don't think it's a bad idea to hedge a bit and get some digital IC cards but there's the very real possibility that the yen could continue to weaken even further so personally I wouldn't get as many as possible at the current time.

Even after the Japanese government yen intervention it never went below 140 JPY to the USD and it's already back over 143 yen as of this writing. Personally I think there's a possibility that before the end of the year we will see 155 JPY per USD.