Wii_Master
Besides Modern Warfare 2, the HD platforms also still have Assassin's Creed 2, which should do very well also.
psrock, I'm not sure Final Fantasy will actually make it into the top 5 for the PS3. Right now for the PS3 I think it is shaping up to be.
1. Modern Warfare 2
2. Uncharted 2
3. Assassin's Creed 2
4. Fifa 10
5. Pro Evolution
All of those games I think will be around the 1.5 million mark or above by the time Final Fantasy XIII launches in Japan. If it does make it into the top 5 though, it won't really be adding that much to the PS3 total because it will just be replacing a game that sold slightly less than it.