2 Maybe? When Resident Evil 5 hits that will top it out, but who knows Halo Wars might even perform that second week.

In Europe, it will be coming out the same day as Halo Wars. If Halo Wars lives up to the sales the series is capable of producing, we're looking at zero weeks for that region. As for America, it will likely only have one week (Halo Wars comes out at the beginning of March). And since there isn't even an announced launch date for the game in Japan, I can't really say.

When does Halo Wars launch?

Oh wait, Halo Wars is coming out at the same time?

It will very possibly be on top for zero weeks.

Halo Wars might do it for three.

What was the last PS3 game that had the lead on worldwide sales? MGS4?

It may not, its going up against the Halo brand in the same week I think.

Ok one week. Halo Wars seems to be launching the week after.

Halo Wars

Americas: March 3rd

Europe: February 27th

Killzone 2

Americas: February 27th

Europe: February 27th

Using Gamefaqs's release dates.

0 weeks, Wii games will be on top for most of the year.

Is titles releasing in Europe first becoming a trend? Or does Halo Wars an attempt by Microsoft to counter Killzone 2 in Europe, where Killzone 1 apparently did better?