Will Call of Duty: World at War out sell Gears2?

[Kantor]

Yes, to both.

Call of Duty: World at War (combined) will be the best selling shooter until CoD: Modern Warfare 2. The 360 version alone will be the second best this gen, only just beaten by Halo 3.
If Halo 4 decides to come out this gen, I think Halo will reclaim supremacy.

But for now, Call of Duty is king of shooters.