Well I work for GS and if it's anything like our store we can no longer promise a machine before christmas I think the first like 30 or so are confirmed for day 1 (we've got like 45 total) but we have to tell all customers that we cannot guarantee there achines for day 1 (just to cover ourselves)
So its a possible that there were just covering themselves and you'll probably get your machine or they have really taken too many orders and it's unlikley you'll get your machine for christmas, like others have said GAME will get the most machines for luanch but TBH honest nobody knows how many their getting yet theres no point speculting until then however I would expect a lot more machines than we saw for the 360 luanch