Actually it's a quite possitive predcition for Microsoft
The Xbox 360 S model clearly demonstrates growth quite similar to that of the PS3 Slim, even though the comparison isn't perfect. In particular, the first month of the PS3 Slim was just barely in August 2009, when some systems arrived in stores just before the end of the NPD Group's reporting period. So, while sales were up modestly, the full effect was not felt until September.
Sony's Slim boosted its annual system sales by 66 percent, up from 2.95 million to 4.90 million. Were Microsoft to realize a similar rate of growth by the end of May 2011, they would have realized sales of 8.07 million systems annually, up from 4.86 million in the previous 12-months.
(For a bit of perspective, the Nintendo Wii still realized sales of 8.99 million systems in the past 12 months, even with its recent weaker sales.)
http://gamasutra.com/view/news/30316/Analysis_Xbox_360_S_Model_Tracking_Ahead_of_PS3_Slim.php
