I just noticed in the preview of the next episode, Mike's sitting with some chick who asked "who killed Gus?" with him simply replying "havent I told you not to worry about that." maybe that means new key people will be revealed.
The next ep is called "Madrigal". Look who owns Los Pollos Hermanos:
Madrigal Electromotive GmbH....that scene above is from season 3, ep 9.
Fred.