Leo-J said 250k and it probably will be around 225K 25K difference is not a huge deal.
Soriku predicted 5 million first changed it though.
8 million nah. 7 million huge chance that it will.
And I agree with some people that it is possible that PS3 will do better next year. I depends of a lot of factors like 'Will MGS4 release? What about KZ2? How will white Knight Story do ? etc..