The night before my interview day there was a reception for all those interviewing the next day. We met a bunch of previously new hires for drinks and to ask general questions. It was a pretty relaxed atmosphere although the people I talked to really stressed the idea that Cap1 was very much like college. This did not endear them to me, but it might for some.
On the actual interview day there were 3 interviews: 1 behavioral and 2 cases. Both cases were relatively straightforward although the first interviewer I had was rather inarticulate, so understanding what he wanted was a little difficult. However, this was one of my first case interviews. Generally were pretty prompt in responding and I heard back within 5 days.