It should probably end up close to 26 million at the end of 2008. Microsoft needs to sell 4.2M units to do so, and with its low sales in Japan it more or less has to do so in only 2 territories.
Last year it sold around 2M units in the US in November and December combined and so far this year has tracked close to 2007. Based on this trend and adding in the rest of the Americas it might end up selling around 2.5M units until the end of 2008.
This means Xbox 360 needs to sell over 1.5M units in others. Given the huge drop in price this year which resulted in and the better sales compared to last year it seems possible, but its not a done deal yet.
I think it will eventually manage to get to that 26 million in 2008, but only just.







