Battlefield 3, as well as last year's Need for Speed: The Run. The studio itself is located in Gothenburg, Sweden, only five hours away from Stockholm, home of Frostbite 2 creator and Battlefield developer, DICE.
The studio is currently hiring, apparently from the ground up. There are numerous positions available, ranging from creative director to UI artist, gameplay designer, audio designer and more. No other details are given. The franchise and genre of the current project will only be revealed to job candidates after they agree to a non-disclosure agreement. Hopefully we'll learn more during GDC this week.