I like Gamer's prediction... not only won't, but has wii having huge increases in shipments by then... which is possible...

Is this NA only or worldwide?

If NA only, then WILL (+100k)
If worldwide, then (+20k)

 I assume it's NA only, as it's not being release in Japan at that time (AFAIK), and we don't get weekly charts for other/UK sales.

I compared last week's Wii sales with last week's 360 sales and doubled the 360 numbers. You get this:

NA: WON'T (32k)
WW: WON'T (130k)

Won't

Halo 3 release dates according to Wikipedia are as follows:

-Sept 25th - North America
-Sept 26th - Europe
-Sept 27th - Japan

The number in question is worldwide, I did put it in the OP but I have added a bit of bold to help it stand out to make sure people can see it clearly. If anyone posted their number in error because of this please make a new post and mention that it is a correction and I will make the change.

Edit:

@mariozeldametroid,

Is this your prediction or just a statement?

@DMeisterJ,

I need a number +/- to add you to the list.

Will +30K

I don't believe the whole all Halo fans already own a 360 theory, since more than half of 360 owners didn't own an original xbox. Also, I think Halo + Price Drop will be a good combination for console sales.

of course it WON'T
MOST, not all, but many Halo fans already have a 360

@sqrl: just a random brainstorm, nothing official.

Some data from the past few weeks:

• July 22: Wii 237k, 360 53k (Wii +184k)
• July 15: Wii 264k, 360 57k (Wii +207k)
• July 08: Wii 214k, 360 60k (Wii +154k)
• July 01: Wii 231k, 360 68k (Wii + 163k)

That adds up to a weekly average of Wii +177k for the past month. (For much of this past year, however, the Wii has been a bit lower than that, usually running along the lines of +150k over the 360). I do think that 360 sales will significantly increase on the week of Halo's release. However, to beat Wii's weekly sales, the hardware numbers would have to more than quadruple for the week; even tripling the usual 360 numbers still wouldn't put them past the Wii. That seems.... unlikely to me.

I'm going to estimate that 360 hardware sales will be something on the order of 2.5x to 3x the usual rate for the Halo release week. But that will still leave the 360 lower than the Wii. I'll say Wii +30k for the week, followed by a rapid drop-off in 360 sales in the following weeks. (This is why it will be absolutely impossible for either the 360 or PS3 to ever "catch up" to the Wii in sales; when you must triple sales just to pull even with the competiton, even huge game releases won't be able to do much.)