This is an old news, from April 2012.
It is interesting that focus has moved from "editing" to "storage".
Because of "mobile first", and phones and even tablets are not very good for editing.
Microsoft "answer", SkyDrive, has almost identical purpose: sharing files online.
Editable "documents" are exception, rather than a rule.
The API is also REST based, and there are samples in many prog. languages...
Apparently Apple has again defined user expectations, with iCloud.