Like any poll, it only captures the mindset of Japanese \'gamers\' within a very limited timeframe.
Although it\'s usually fairly predictable, sometimes small surprises do appear ; let\'s say for example if all of a sudden Xbox360 gains more popularity in Japan even if temporary. Of course, Madden is never going to be a system seller there.
So, yeah atm the Japanese show big interest in Wii ; but we all know they like their beloved franchises as well which historically appeared on the Playstation format and they love their juicy graphics. Japanese PS3 interest is inevitable.