Based on past games in the series, Final Fantasy always sells the best in Japan. Then comes North America, then Europe.
Based on that and the general breakdown of sales per region, I'd say this will be close to the mark:
Japan
PS3 - 2.2 million
North America
PS3 - .85 million
360 - 1.15 million
Total - 2.0 million
Ratio: 1.35:1 360:PS3 (between that of SFIV - 1.04:1 - and RE5 - 1.5:1)
Europe/Others
PS3 - 1.0 million
360 - .7 million
Total - 1.7 million
Ratio: 1.42:1 (just above that of SFIV - 1.37:1 - and RE5 - 1.29:1 - above mainly because using .5 million increments caused any other figures to be significantly below those ratios)
In the end, I'm thinking the game will end up around 6 million worldwide (5.9, using my figures above), with the PS3 version taking a bit over 4 million of that 6 (4.05, based on my figures), and the 360 version nearing 2 million (1.85, using my figures). The ratio between both versions will be around 2:1 (2.19:1, based on my figures).







