updated 08:54 pm EDT, Wed September 5, 2012
Post pulled, update said to add editing capabilities to iOS
A post only briefly available on the Google blog announced features for the upcoming version of Google Drive for iOS and Android. The new version allows iOS users to edit Google Documents, and view Google Presentations. Google has since deleted the post, but presumably, the update is imminent.
Previously, iOS users had to access a web browser to edit or view a Google Documents file -- the new version removes that requirement. Android users are now allowed to create folders, create and edit tables in Google Documents; comment on Google Documents; and view, present, and comment on pre-existing presentations.