Call of Duty 5 set in the Pacific?

Someone who is more than close enough to know such things has tipped us off over the weekend that, yes, Treyarch are indeed hard at work on Call of Duty 5. And that, yes, the series is heading back to World War II. That's the stuff we'd heard already. What we didn't know is that, according to this tipster, the game's set in the under-utilized Pacific theater, something only one major WWII shooter - the awful Medal of Honour: Pacific Assault - has tried before.