Mythic's Mark Jacobs has posted a message to players that doesn't get into specifics, but is designed to keep the Warhammer player base calm and reassure them that the game is still doing fine, and that today's cuts are also part of moving the game from the heavy pre-launch phase to a post-launch state. Here's the conclusion of that message:
Although we now have fewer developers on the game than we did leading up to the launch, WAR still has a larger dev team today than we ever had for Dark Age of Camelot. At Mythic, we’re committed to maintaining the trust of WAR players – we’re going to deliver the content and service that keeps you playing.
Massively is reporting that somewhere between 60 and 130 positions have been cut, and that these cuts impact the design and development departments.