It looks like the Japanese version of the Sony Xperia Z1 will come with some update features, according to the guys over at the Xperia Blog, the handset will feature an IR blaster.
As well as the IR blaster, the Sony Xperia Z1 in Japan will also come witg 32gB of built in storage, the global version of the handset comes with 16GB of built in storage.
On top of that the handset will feature Full-Seg/NOTTV support, the rest of the specifications will remain the same and will include a full HD 5 inch display with a resolution of 1920 x 1080 pixels, the device is powered by a quad core 2.2GHz Qualcomm Snapdragon 800 processor.
Source Xperia Blog