I can't really add much to what Yoda has said, except that, for the interview, you should definitely think more about your questions submitted for Phase 2 - there are definite recurring themes.
Mixed feelings about today, but it was definitely a good experience. Good luck to those final few going tomorrow, and to everyone else who is now waiting to hear back!
AJMcC
P.S. Avoid M4, M25 and M1 like the plague when going to an interview - a little lesson I learned today.