Well, here's what I think the PS3 sales will be:
120,000 to 160,000 units per normal week.
Around 475,000-650,000 units per normal month.
So i'd guess the Slim will sell:
September - 675,000
October - 875,000
November - 1,600,000
December - 3,000,000
Total = 6,150,000 (last year the 360 sold 7M in the same period)
Total for the 2009 Calendar year = Roughly 10.2M
Total for Calendar 2008 = Roughly 10M
Means they would just fall short of their 13M target for the FY end.