This video from the Pune, India team's Open Mic Webcast ("Features of SmartCloud Notes in Hosted and Hybrid Environments") includes an overview of SmartCloud Notes as well as minimum requirements and architecture and customer flow.

More information on this session, including the slides and full video can be found at the Webcast document for the event:  http://www.ibm.com/support/docview.wss?uid=swg27046105