Well they supposedly brought the team behind battlefield 2 in for the online part of the game because they feel that they are better at the story line asspect then the multiplayer part
"Medal of Honor is being built with a best-in-class single-player campaign. The Medal of Honor development team at EALA has been hand-selected by the studio leadership of General Manager Sean Decker, Executive Producer Greg Goodrich and Senior Creative Director Rich Farrelly. To compliment the single-player experience, EALA has enlisted the multiplayer expertise at EA DICE. This team will develop the multiplayer experience of Medal of Honor. These two studios are coming together to deliver a world-class Medal of Honor that is poised to re-set the franchise for a new generation"