I have participated in just a few such sessions so my comments are no so much a reaction to prior C&Ts, but more of what might be helpful to a new participant:
- Purpose of the Session
- Target audience and pre-requiste knowledge/experience
- Overview of the solution: what it can do and what it can't
- Drill down on new/improved features (features->design->code)
- Demo
- How to get started using the solution
- Q&A