On a new page on its website describing the features of Mail in iOS 4 Apple has seemingly given a glimpse into the future of its iWork Apps on the iPhone platform.
In particular the feature highlighted is the ability for attachments received via email to be opened in the correct app on the iPhone. In this case a Keynote file is showing as being abled to be opened in Keynote, an app not current available for the iPhone.
Mac Rumors who made the discovery correctly points out that upon the release of the iPad Apple made Pages, Numbers and Keynote available for the multi-touch device. Apple today announced plans to bring iMovie to iPhone 4.