”For Day Zero, we’re already making improvements to the game based on early feedback to ensure fans get the best possible experience. In addition, within the first week after launch, we’ll be adding two additional multiplayer maps to the game.” said Noseworthy.
”As for post-launch plans, we are extremely interested in working with Microsoft to offer several types of free and premium downloadable content through their Games for Windows - LIVE Marketplace. In fact, there may even be some DLC available during the first few weeks after the game’s released if everything goes to plan.”
You can see more here.