I think one area is this:
iCloud Drive keeps the concept of application-specific folders for data, but it allows users (and other applications) to see the filesystem and access data stored in multiple app folders. People who don’t care to know where their files are can continue to ignore it, but power users are going to be able to manage data like they’ve wanted to since iCloud was introduced.
In iOS 8, you’ll be given the opportunity to upgrade from standard iCloud to iCloud Drive once you sign into your account, but you should tread lightly hereconverting your account to use iCloud Drive is a one-time deal and it can’t be reversed. iOS 8 still supports “Documents & Data” sync, the old-style iCloud syncing method that will continue to work with Mavericks and older iOS versions. If you still use Macs running OS X 10.9 and you want to sync data between them, don’t turn iCloud Drive on. If you’ve upgraded to the Yosemite Public Beta and are using it exclusively or if you’re from the Future and Yosemite is already out, turn it on. If you only use devices that run iOS 8, turn it on. Just don’t click through those upgrade prompts without thinking about it first.
Rush Limbaugh spent 10 minutes yesterday on this one time sign in jazz for icloud.
Thanks for the information.