C.f. Apple website page on iCloud Drive: http://www.apple.com/ios/ios8/icloud-drive/
I understand iCloud Drive makes easy for an individual user to save a file to the cloud and work on it from any of his or her own devices, i.e. a solo use case.
My question is: with the new iCloud Drive, can different users, with different Apple accounts (not necessarily in the same family), share and collaborate on files? E.g. Could an iOS 8 app help a bunch of users collaborate on, say, a video editing project where all the heavy raw footage video files are shared on iCloud Drive?