Infamous sold almost 3 million. Infamous 2 sold about 1.5 million.
I think most people are way too optimistic about the sales. I think it will sell slightly better than infamous because there are hardly any games on PS4 right now, so the game will get a boost in sales by being a very early released PS4 exclusive.
I think about 3.1 million copies sold on on here after two years max.