'the cloud' is associated with tagging type metadata and searching descriptions; I think that's what is being referenced.
The actual implementation of storing and searching also becomes someone else's problem. In a way it's just another slosh back and forth in the cycle of centralization and de-centralization of processing/storage.
Similarly the sloshing back and forth between predefined ontology/semantics and "deep learning". In a way, isn't Cortana attacking many of the WinFS problems from the opposite direction? Cloud first and "deep learning/AI" versus local first and "deep semantics".
The actual implementation of storing and searching also becomes someone else's problem. In a way it's just another slosh back and forth in the cycle of centralization and de-centralization of processing/storage.