Like most apps today (i.e. Evernote), the Blogger app will feature automatically synced blog posts, so you can start editing on one device and then continue doing it on another. The app will also allow users to add photos from their own galleries or by taking a new photo from within the app. Labels and locations can be added as well.
Since it is only the first release, you can expect a lot of features to be missing, however, initial impressions of the app seem pretty favorable right now. Head over to the Apple App Store to download Blogger for your iOS device now and let us know what you think.