As noted by 9to5Mac, the icons for iCloud Storage management are handled over the air, so it is likely that the icon images were prematurely uploaded to Apple's servers. iPhoto is one of the Apple-made iOS apps that has not yet received an update for iOS 7. iBooks, iMovie, and the iWork suite of apps are also awaiting an update.
Apple could be planning to use its iPad event to display the redesigned versions of both iPhoto and GarageBand, as Apple has touted the iPad's productivity capabilities with those apps in the past.
iPhoto for iOS is a free universal app for new iOS devices and $4.99 for other users. It can be downloaded from the App Store. [Direct Link]
GarageBand can be downloaded from the App Store for $4.99. [Direct Link]