Since Apple's WWDC keynote ended a few hours ago, we've installed the iOS 9 beta and begun digging for new stuff. Apple previewed a handful of the software's features at the event, but as usual, there are a number of additions and improvements it didn't talk about.
One of those features is a standalone iCloud Drive app. It's not immediately apparent, but while launching an app we received a pop-up asking us if we wanted to install it. We were also able to access it via the Settings app iCloud > iCloud Drive > Show on Home Screen.