This was seen on Digg. A Job opening at Treyarch is looking for a level builder that is interested in WWII (see bold below)

Description: Treyarch (an Activision studio) is looking for talented and motivated Level Builders to join the team that developed Call of Duty 3, Call of Duty 2: Big Red One, and Call of Duty: United Offensive! We have positions open for both Multiplayer and Single Player builders. We are located in sunny Santa Monica, CA, close to the beach.

Treyarch is dedicated to making AAA quality, commercially successful games, with the best and brightest talent. If you are ready to do the best work of your career in an environment that supports, enables and rewards you, please read below to see how you can become part of the Treyarch team:

Level Builder Tasks:
* Build realistic levels for an industry leading First-Person Shooter action war franchise using Radiant quickly and efficiently.
* Detail & polish levels (including lighting) based on photo reference, concept art, and design documents.
* Take direction from design leads to refine mechanics of the map.
* Research subject matter for history and look of the map.
* Be able to meet deadlines and communicate clearly and effectively.
* Work effectively as part of a design team to formulate strategies and implement ideas.

Qualifications Level Editor experience with Radiant, Unreal, or Quake. Radiant preferred.

Working experience with First-Person Shooter or Third-Person Shooter genres (console or PC). And if you’re a fan of World War 2 shooters, then even better!

Working knowledge of the following languages: C++, LUA, Unreal, or GSC. GSC or C++ preferred.

MOD Community experience is good. Industry experience is better.

Must have a demo reel or portfolio of screenshots available to be able to interview.

Souce: Here

UPDATE
Thanks to Matt over at PCOD has this info posted:

Kotaku has a report up claiming that a source close to Treyarch has revealed that Call of Duty 5 will be set in the Pacific theater of war.

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. While (if true) the move back to well-worn WWII is mostly disappointing, if this game can branch out and explore some of the less “popular” aspects of the conflict (China, Burma, New Guinea), it might not be so bad.

As soon as we know more, so will you!