Update: A ton of detail's just come out of the gamesTM issue. See here.

Update 2: And now you can read the entire OXM UK cover article online.

Call of Duty 5 has been confirmed as being called Call of Duty: World at War and is set in the Pacific theatre of WWII.

The news comes from subs issues of UK mag gamesTM, which landed this morning.

Thanks, evilashchris.