The LG Optimus G Pro (http://www.gsmarena.com/lg_optimus_g_pro-5254.php) is now on sale in Japan through NTT DoCoMo. As you know (http://www.gsmarena.com/lg_optimus_g_pro_to_be_launched_in_april_-news-5534.php), instead of the 5.5" FullHD display seen on the international version, the Japanese one features 5" IPS LCD of the same resolution.
On the inside, the NTT DoCoMo-bound Optimus G Pro packs 1.7GHz quad-core Qualcomm Snapdragon 600 CPU, 2GB of RAM and 32GB of internal memory. At the back, the 13MP camera is also left untouched from the international G Pro, as is the 3000mAh battery. However, it's now non-removable.
To pack an entire Optimus G Pro in what's essentially an Optimus G (http://www.gsmarena.com/lg_optimus_g_e975-4941.php) body, LG had compromised the slim profile of the device a bit. The Japanese Optimus G Pro measures 139 x 70 x 9.9mm.
Running Android 4.1.2 Jelly Bean, the LG Optimus G Pro is now available through NTT DoCoMo and is ready to take advantage of the carrier's LTE network.
Source (http://lgepr.lge.com/upload/press/2013/Optimus%20G%20Pro%20Japan%20Launch%20Release%20-%20FINAL%20_130404%5B20130403135857731%5D.pdf)
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