From an interview he did with Next Generation (hopefully he gets a chance to make a game for it):
http://www.next-gen.biz/index.php?option=com_content&task=view&id=8769&Itemid=2&limit=1&limitstart=2
Which platform would you like to work with in the future?
"The Xbox 360. Definitely, I want to develop on this platform. It is really easy to work with. It is also quite popular outside Japan on markets that I would like to aim at. Specifically, I think of the American market as the Major League – I would like to go there and be successful."