Why Japan only? I know some might question the styling for the US/European market, but still some will buy on performance irrespective of looks even if initially put off. Some said no-one would ever buy a square driver either. I hope they do release some Burner irons in the US/Europe, even if they changed the styling a bit. Certainly the driver has been getting a lot of talk in golfing forums.
Having said that I haven't been impressed with the latest Taylormade GI irons. Especially the R7 Draws, which you'd think would be very forgiving since they are marketed towards the average joe who slices.