TechCrunch editor-in-chief Erick Schonfeld spent some days in Tokyo earlier this week for the TechCrunch Tokyo 2011 conference, which I attended and GREE CEO Yoshikazu was invited for as a speaker.
Here is an interview with Tanaka that Schonfeld did at the day of the event (this week Tuesday), divided into two videos.
Part 1:
Part 2:
Schonfeld also wrote an article on GREE, comparing the company with Zynga.