GameSpy.com's Battlefield 1942 interview talks with the three project leaders from Digital Illusion CE talking about this upcoming "tactical FPS." Here's a bit from the conversation to give a feel for what the game is to be about:

GameSpy: Tell us about the overall theme and idea of the game.

Ola Holmdal--Lead Designer: Battlefield: 1942 will be a tactical first-person shooter set in World War II. It introduces the player to all-out war, with every aspect of warfare accessible to players and bots. In order to defeat your enemy, you will use combined arms tactics in the true sense of the word, combining tanks and dive-bombers, submarines and carriers, and machinegun nests with AA-artillery. Every aspect of WWII warfare will be accessible to a player and his friends from an FPS perspective, and the ultimate goal is to win enough campaigns to win the war.