I think Okami will do better in Japan than Z&W did.
I am gonna say 25k first week in Japan, 50k in Na, 30k in others.
105k first week WW. big drop 2nd week, maybe 45k WW, after that it will decline slowly and sell between 350-500k WW LtD.
End of 2009 Predictions (Set, January 1st 2009)
Wii- 72 million 3rd Year Peak, better slate of releases
360- 37 million Should trend down slightly after 3rd year peak
PS3- 29 million Sales should pick up next year, 3rd year peak and price cut