If I were to look at who would be the best person to give me an overview of Power Pivot or the next release of SQL Server, I without a doubt would pick the man himself Mr. Donald Farmer from Microsoft. However getting the chance to sit down with Donald on a one on one base is very difficult; he is one of the driving forces behind Power Pivot. Not too long ago I had the chance to work out a schedule with Donald that will allow for a FREE event that is going to be hosted by vConferenceOnline in coordination with SSWUG. This Free event is completely free but will require that you sign up. You can find all the information here:
This event looks like it is going to be a 4 hour review with a full list of the sessions on the registration pages. If you work with SQL Server I honestly cannot think of a reason why you would want to miss this event.