Starting next month East Japan Railway Company (JR East) will be selling a new JR Kanto Area Pass available to holders of a non-Japanese passport arriving at Haneda or Narita Airport. The discounted pass is valid for 3 consecutive days and allows unlimited rides in Tokyo and the surrounding Kanto area on JR trains, Shinkansen and even some private lines. The passes costs 8000 yen for adults and 4000 yen for kids under 12 and will be used starting January 1st 2012.
As someone who has used a rail pass while visiting Japan I can’t stress how useful this could be and it’s even more convenient than the pass I used because it can be bought in Japan at the Kanto area airports and major stations like Shibuya, Shinjuku, Yokohama and Ueno. Try not to confuse the JR Kanto pass with the JR East Pass, JR Raill Pass (which I used) and the myriad of other passes available for JR lines, other railways and even buses. More details on the JR Kanto pass is available on the East japan railway website here. Feel free to ask any questions in a comment below!