iOS 5 beta 4 seems to be all about cleaning up the operating system and testing new features prior to the system’s launch this fall (likely in September). Now, in iOS 5 beta 4, Apple is also testing and putting the final touches on their upcoming iCloud cloud-services platform. Previous iOS betas featured iTunes in the Cloud, Mail, Calendar, Reminders, and a few other features – but iOS 5 finally brings Documents in Cloud to the table.

Apps make it possible to create amazing presentations, write reports, and more right from your iOS device. You don’t have to manage your documents in a complicated file system or remember to save your work. Your documents are just there, stored in your apps, and ready whenever you need them. And now, your apps can store that information in iCloud. Which means you can access your documents — with your latest updates — on whichever device you happen to be using at the time. Even better, this all happens automatically, without any effort from you.

Documents in the Cloud is one iCloud’s landmark features and basically syncs iWork documents between all of your iOS 5 devices. As explained at Apple’s WWDC kickoff presentation, you can begin work on an iWork documents on your iPad, for example, leave your iPad at home, open the document on your iPhone (with iWork for iPhone), edit and the edits will all be synchronized. We’re looking forward to seeing if Apple will make Documents in the Cloud compatible with iWork for Mac and the service. Thanks, Jack!