Sidenote: Killzone 2 is being released tomorrow for NA, sales will likely increase here also :P. I'm also gonna go with 600k NA sales first week, 800k EU sales first week.
Don't think this will happen.
600k NA sales in one week would be 90% of Killzone 1's lifetimes sales. It's definitely a much better game, and I understand that it's been hyped to death and that it's preorder sales are through the roof. But those reports say that it outsells LBP's and resistances first days sales. Both of which sold a few thousand over 100k. Aiming 600k the first week is a bit high IMO. Who knows though, with the reviews it's been getting =p
90% lmao. You sire dont know much of anything. If resistance 1 has sold more then that. Why wont KZ2? KZ2 will sell well. Mark my words. 4 mil MINIMUM total life time. Could be higher I am playing it safe.