Numbers, Keynote, and Pages which comprise Apple's iWork suite have all been updated for both iOS and OS X. New features include collaboration tools to work in documents in conjunction with others. All three apps are also now free with the purchase of any new iOS device or Mac.
The entire iWork suite has been updated with full file compatibility across all devices, both iOS and Mac. All three apps have been updated with refreshed interfaces on both platforms.
One of the largest new features of iWork for iCloud is collaboration tools for iWork which lets you work live with someone else on the same document, much in the same way you can with other editing tools such as Google Docs. Other new features include the ability to share links from your Mac right to iWork to iCloud with anyone else using iWork for iCloud.
The updated versions of iWork for iCloud is available for free for both Mac and iOS starting today.