Please look at the S4S release notes for more details.
The latest versions include breaking changes so existing users cannot simply overwrite the existing libraries and expect the functionality to continue working. A recompile of the impacted website projects will be required.
S4S ECM has experienced even more change. The Email Campaign Manager extension now has a wide range of features to help Salesforce users effectively filter and push their report outputs and campaign lists to Sitecore for email dispatch. New functionality also allows the campaign results to be reflected into Salesforce. For example, opt outs and bounced emails are mapped back to individual members of each Salesforce campaign.