That number doesn't surprise me since Xbox never really took off in Japan like it did in America so they are probably more excited about Playstation 3 as of right now.
Microsoft will have a chance to show the Japanese what the Xbox360's all about this week at the Tokyo Game Show (Japanese E3) so maybe that will change things a little bit. The PS3 sounds great on paper but I doubt it will be playable at TGS, while the X360 will be for sure. Playing is a lot more exciting than speculating.
I, too, would be interested in hearing from any Japanese C9'ers about how they percieve the Xbox and Xbox360 (or Microsoft in general) especially compared to the PS3.