I also thought about it, but I'm not sure if this is possible right now. This is definitely the goal of the ember-data command to have this in the future.
In theory, it should be just the same as when you find a stable network connection, switching model adapters to a RESTAdapter (or similar) from LocalStorageAdapter.
You can take a look at the method DS.Store.adapterForType- it was mentioned by Igor in his conversation at the Ember Camp when this kind of use (near the end of the video that I think):
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