I agree with Branko and Mummelman. The bulk of 360 sales come from the US, which is where the biggest % drop will be.
DS will have the biggest number drop, probably nearly 1 million less. Wii will have the second largest drop in numbers, but I am not sure about % wise, it will probably be a smaller % than 360 drop, but whether it is smaller than PS3 I don't know.
PSP looks like it may have the smallest drop in %.
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edit, just realised you said "the coming weeks", wheras I was referring only to the week we just finished.








