This is going to be a close call.
The 360 is closing the gap rapidly. the October USA NPD number were nothing short of stunning. November could be even greater with the monster GOW2 release and some Fable leftovers. December should see the boost from the casual buyers and here the low price of the 360 will play an even increased role when parents will choose the cheapest console for little Johny.
In "Others", the 360 continues to edge out the PS3 week after week.
A million is a large gap, but with the current rate it is plausible the 360 will close it.
So overall the 360 could win by a nose or the PS3 may hold on to a slim lead. 100K-300k either way. Virtually a tie.
That said, the numbers for the full year is good only for bragging rights. The more important numbers are the numbers just for Nov-Dec because these are the numbers that will set the tone for Q1 of 2009. The winner of Nov-Dec will get to carry its momentum to the next quarter. Here I think there is little doubt that the 360 is going to come out on top.
Prediction made on 11/1/2008:
Q4 2008: 27M xbox LTD, 20M PS3 LTD . 2009 sales: 11M xbox, 9M PS3