The initial phone screen and final interview were comprised of all behavioral questions. The questions were divided into 3 sections based on the PVP (Purpose, Values, Principles): the Power of Minds, the Power of People, and the Power of Agility. The questions tend to be a little more complex than usual. For example: "Tell me about a time you used a particular approach to solve a problem, and then used that same approach in a different situation to solve another problem."
My advice is to be prepared. Have a list of the attributes you want to demonstrate (Leadership, Communication, Teamwork, Problem Solving, Risk Taking, etc.), and then have answers demonstrating each attribute. Ultimately, the questions are trying to determine whether or not you possess a desired competency, so it's better to prepare answers for personal attributes, instead of attempting to have an exhaustive list of answers for every question.
I had to take two reasoning exams. The first was 15 questions, and was a pre-screen, and the second was an hour long at their HQ. The first consists only of figural reasoning, while the second also includes logical reasoning and basic algebra problems in word format. It seems designed more to weed out unsuccessful applicants than to assess reasoning ability.
The people there were amazing. Very driven, motivated, highly intelligent, and capable. Lots of Type A personalities. Many had worked there for their entire career. I was very happy to have received an offer.