Here is the list of details what BCS can do in SharePoint 2013:
- Reveal external data from enterprise applications, web services, and OData services in SharePoint Server 2013 Preview and in rich-client Office applications.
- Provide Office-type behaviors (such as Contacts, Tasks, and Appointments) and capabilities to external data and services.
- Provide complete interaction with the data, including write-back capabilities from Office applications and SharePoint Server to the underlying external system data and business objects.
- Enable offline use of external data and processes.
- Bridge the unstructured world of documents and people and the appropriate structured data that is locked in external systems.
- Reveal external data from enterprise applications, web services, and OData services in SharePoint Server 2013 Preview and in rich-client Office applications.
- Provide Office-type behaviors (such as Contacts, Tasks, and Appointments) and capabilities to external data and services.
- Provide complete interaction with the data, including write-back capabilities from Office applications and SharePoint Server to the underlying external system data and business objects.
- Enable offline use of external data and processes.
- Bridge the unstructured world of documents and people and the appropriate structured data that is locked in external systems.