So Sony was spot on and now projects 15 million.
Your 8 million forecast for the XBox 360 seems fair considering the decline in sales for 2009 and the first quarter of 2010, but if the 360 can do another 10 million this year total sales could be close FY 2010.
If your XBox 360 forecast holds through as well as Sony's forecast for the PS3, by the end of this fiscal year the PS3 will have outsold the 360's total shipments by 2 and a half million units!
The gap by the end of March 2010 was 4.5 million consoles to the advantage of the XBox 360 (taking equal timeframes it's 5.5 million to the advantage of the PS3).