Start of 2009, no one believed the PS3 would outsell the 360. It was the late price cuts that pushed the PS3 ahead of the 360 in 2009. It will happen again with 360 late price cuts and the US sales win for the 360 will wipe out all the PS3 gains worldwide in 2010. 360 will outsell the PS3 in 2010 between 500k to 1 million units in world wide sales. PS3 2010 sales + 500k = 360 sales in 2010.
360 will sell 6 million units in US in 2010. Again increasing in yearly sales in the US region. PS3 will sell around 4.5 million in the US. PS3 outsell the 360 in Japan and Europe by around 1 million and victory will be for the 360 by 500k over the PS3 in 2010 total console sales.
I believe Microsoft predictions will come true in regards to the 360 sales fortune. Win in US will erase the PS3 gains in Japan and Europe = 360 wins overall worldwide.
360 has won previous sales years over the PS3 by winning only the US region, but losing the other two sales regions.
The sales gap will be much closer than last year. PS3 picked up 2 million more sales than the 360 because a 25% price drop and PS3 Slim model pushed the sales. PS3 is unlikely to have a price cut in 2010. It is the 360s time to shine with Natal and more price cuts in 2010. 2006, 2007 and 2008 - the 360 outsold the PS3 on average by 1 million in each of those years.