I like predictions!
Hmm
MAG -> 1.8-2.8M depending on Others support and whether they can get people off MW2 long enough to try it.
God of War 3 -> 2.3-3M within the range of the first series, its limited by being single player only and by its violence which will mean several countries may ban it.
Heavy Rain -> 1.5-2M, its quality suggests 3 million but its target demographic limits its overall reach. The biggest fish in a small pond effect? I expect surprisingly high sales for this title in Japan.
Resistance 3 -> 2.5-3M. Its got a good brand name, going up against Treyarch not Infinity Ward and Insomniac learn from their mistakes. However being the third title this generation I will limit this to the range of the first and seconds sales.
Gran Turismo 5 -> 10-13M LTD. I only believe there will be one GT game this generation and last generation I suspect not everyone who got GT3 bought GT4 yet they remain GT fans in general. This game will get continually updated and every year they will probably release an update to the disc based game with even more cars.
Last Guardian -> Aprox 3M because its got massive appeal in all markets for them including Japan so its the full weight of their entire userbase and it looks to appeal to a wider range of people than Heavy Rain.
Agent -> Who knows? I'll give it 4M because of its GTA roots.
Mod Nation Racers -> aprox 5M. I think it'll sell a little more than LBP as it also gets a boost from the racing heritage of the userbase as a fun alternative to GT5.
