Apple has updated its iWork iOS apps to version 1.6.1 to bring iCloud support for Documents in the Cloud as part of OS X Mountain Lion. Essentially when you make changes to a document on your Mac or iOS device, changes will be synced in real time.
What’s New in Version 1.6.1
Pages/Numbers/Keynote 1.6.1 works with iCloud to make documents automatically available between your iOS device and Pages on your Mac*. Changes made to a document on one device are instantly available on the other.
*Requires Pages 4.2/Numbers 2.2/Keynote 5.2 or later installed on OS X Mountain Lion