I'd expect to see around 2 million (1.8-2.5 million) first week (combined for Japan, NA, EU etc). By the end of the first month, 3.2 million or so. Come the end of 2010, I'm thinking 6.5 million (depends on when it actually launches in NA/EU though).
Lifetime, I think 12 million is optimistic personally, but not impossible. I think 10 million is definitely attainable, but isn't guaranteed. 8 million minimum though, expecting at least 9 million though. 9 million would be my lowest expectation, with 11 million being the high end for me.