It would seem logical to be able to have private always-on servers which do not have access to the synced files in decrypted form. Something like the nodes Bittorrent Sync uses to connect machines behind NATs, but at the same time caching content. Using services like Backupsy as such supernodes would then not automatically bare the files to that service. This would require another type of key, a key that lets a node find and store encrypted file fragments belonging to a particular "account" (master key, really), without being able to decrypt the files. Are there any plans for something like this?
