From their announcement:
In a press release issued today Brian Farrell, president and CEO of THQ, revealed game-changing plans for the project.
"As previously announced, we have been actively looking for a business partner for the game as an MMO. However, based on changing market dynamics and the additional investment required to complete the game as an MMO, we believe the right direction for us is to shift the title from an MMO to a premium experience with single and multiplayer gameplay, robust digital content and community features."
"Because we believe strongly in the high-quality and vast creative work that is in production, this is the right decision for both our portfolio and for gamers devoted to this powerful property."