Hello,
The new Symantec Endpoint Protection Small Business Edition 2013 is not part of the Symantec Protection Suite, which is why you have not received an upgrade notification. Symantec Endpoint Protection Small Business Edition 2013 is a subscription service not a software license, and thus does not fit with the Protection Suite licensing model.
Can I ask why you are looking to upgrade to the new SEP SBE 2013? Are you particularly interested in the cloud management? Or are there features in the new product you would like to use?
BR