http://mssalesdemos.com now includes a demo machine for SQL Server 2012. This includes the Telco demo that was present in the BI X demo machine as well as new demos on SQL Server 2012 functionality. There's a set of demos on PowerPivot, including the auto sales demo which has been shown at various events and one on the food consumed on picnics. There's also a demo on the new Master Data Services functionality.
These demos have a distinctly BI flavour but the machine is configurable if you want to build some demos of your own.
This machine is available either hosted or as a download. Just be prepared to wait a long time for the download.