This is really a funny and unpredictable generation :lol It will be interesting to see sales during the upcoming weeks. Wii will have Wiifit, PS3 has Winning Eleven this week and GT5 Prologue in the second week of December.
If I'm not mistaking the japanese Xstmas season tipically starts the second week of December and ends in the second week of January, doesn't it? In that case we'll see sales going up for every platform soon.
IMO all the platforms expect 360 will do well this year in Japan.
Next year will be more interesting, PS3 has DMC4, Disgae3 and what else in January? Wii?