Speaking at a recent earnings call, CEO Brian Farrell addressed what model WAR40K would adopt. "What we've done is make the business model within Dark Millennium Online flexible so we can use different business models in different territories and exploit the game on a worldwide basis," he said. "We will have not just one business model, like subscriptions. There will be other monetisation mechanisms in the game... The team there is being very thoughtful about how we maximise monetisation in this game."
Seeing as how WAR40K is costing the company over $50 million to create, it seems wise to offer multiple options in order to draw in the largest amount of players possible. The title is being developed by Vigil Games and is slated to release in 2013.