I'd like to know about this, too. We are looking at Salesforce External Data Objects, which can map a remote database into Salesforce if that remote database exposes an ODATA interface. This would allow you, for instance, to look up a record in Salesforce and see a section of the screen that has live-queried data from that remote source.
Does Talend provide any way to expose a database (Oracle in our case) as an ODATA interface? I see options such as .NET entity framework, DataDirect, and Jitterbit mentioned as ways to do this, but it would be great if Talend had the capability.