This is actually a really good question. At first glance I probably would have said "no way", but the inclusion of The Last Guardian demo changes things. It's been announced for a while, it has a lot of followers, both people who played the studio's previous titles and people who just thought it looked interesting based on the trailers.
I'm gonna use the example of Bulletstorm. That game sold rather poorly on PS3 and PC but decent on Xbox360. Why? Well, you could argue that it's by Epic and the majority of their audience is on 360 and that's the reason, but I say it has more to do with the Gears of War 3 beta. A really hyped game with a large following and fans get offered a chance to try it out early? Hell yes they'll buy Bulletstorm.
The Last Guardian certainly isn't as popular as Gears, neither is Team Ico or their games. Overall, I'd say it most likely won't reach 1m sales, but call me cautiously optimistic on this one. It certainly would be very refreshing to see a niche title like this become successful.
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http://forums.ffshrine.org/f63/official-video-game-music-rumble-66118/
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