While building Public site in other terms we call Customer Facing site, you will need better Web Content Management capabilities. Generally you will have Authors who are responsible for producing the content while the produced content will go through an approval process before the content becomes visible on the Public Site.
Generally the Public Sites are also Graphics heavy where you also want to better manage the graphics or digital assets.
SharePoint 2013 provides a new feature called Cross Site Publishing capabilities. Utilizing this new feature, you can design more efficient Public Site. In this blog I will discuss about Cross Site Publishing and with an example of the publishing site implementation.