even if its a better game, its not going to necessarily translate into better sales. like i said, killzone is a failed ip in the old days, so this sequel will be viewed by the average consumer as -meh-
once again, internet hype is the only thing that is spurring this game as a "5 million seller". just like littlebigplanet, its just being overhyped extensively by forums and fanboys. the reality is that the games market is composed of average joes who don't go buying internet hype. that's why the wii is so successful.
so in the end, no, it's not going to reach 2 million. i'm sure about that.