I've heard 50k to 400k from users here.

I think first week it will boost 360 120k, then every week untill christmas it will boost it another 50k.

what do you guys think?

Well it will have a NA boost this week and then again next week it will have a EMEAA boost.

NA

Last year this week in NA Walmart had the special $100 gift card with an Arcade purchase sale so 360 jumped from like 90K to 180K.  I also expect that some new 360 purchasers waited on the sidelines the last couple of weeks waiting for the Kinect bundles.  So I expect a jump to around 250K in NA this week. 

EMEAA

Week ending Nov 14 last year which would be corresponding week to Kinect launch week had 360 over 220K.  I suspect 360 this year will be above 300K.