Develop. Rebellion, which most-recently released Aliens vs Predator, has yet to confirm the details
As is typical with these types of stories, it's hard to tell if the layoffs were part of the natural game development cycle after a major release, or if there's an actual "issue" going on. As for the Derby studio, which once upon a time was Core Design (Tomb Raider), it has been on the chopping block for months. If you are a member or representative of the studio, please don't hesitate to contact us (whether on or off the record) with clarification.