The presentations as well as scripts and videos can be downloaded here:
What's New in SQLServer 2012 for Database Administrators - Nigel Sammy
What's New in SQLServer 2012 for Developers - Mitra Sinanan
SQL Server 2012 Analysis Services - Jason Deyalsingh
PowerPivot - Hasani Holder
SQL Server 2012 Trial
SQL Server 2012 Upgrade Technical Guide
Links to the TTSSUG Facebook site, Twitter account and LinkedIn group are available on the second-to-last page of each presentation.