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.

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 iWork.com service. Thanks, Jack!