Though Nokia has not officially announced Lumia 920 or 620 availability in Japan. But Sim Free Lumia 920 and 620 are available at Expansys Japan. Lumia 920 has color availability in Black and Red while Lumia 620 is available in all 5 colors. Not only this they feature prominently in the Expansys’s best-selling list.
Thanks Geeks for the Tip. Cheers !!
Similarly Amazon is also selling Lumia 920 Sim Free version in Four colors Black, Red, White and Yellow.
Hope, strong demand makes Nokia bring Lumia devices officially to Japan !!