5 parts:
1 HR call
1 SM call
1 Lead SC call
1 Director call
1 Final Interview Case Study
The first 4 are very straight forward. Basic feeler questions to understand who you are, what you want, if you're a fit. Nothing technical.
The final interview was INTENSE. They hook you up with a great S. SE that is working very hard to help you prepare as if their jobs depend on it. You get a case study (IE company xyz is having abc problems. CEO has ABC doubts, CIO has QWE doubts, etc). Demo them a solution for Sales/Service Cloud (Case study will tell you) in 40 minutes. You need to be able to sell the product and really sway the panel. Answer difficult questions. Shine under pressure, etc.