One thing that KZ2 will have going for it is that by the time it's released the PS3 install base will be substantially boosted from now. By February in America PS3 should be at least 8 million and in Others over 10 million.
And as others have said it will have little to no competition. If the final product turns out good and Sony does a proper ad campaign then this game should do 4 million sales minimum.
edit- Resistance 2 should sell ~3 million so I do believe KZ2 will have greater sales.







