Update for Instagram brings landscape view to iOS app
Another change to the app brings Cinema Mode to the front-facing camera. This is the feature used with Instagram video on iOS to help lessen any shaking while recording a video. Finally, the update offers the usual bug fixes and enhancements.
The update is not yet available for Android, but Cinema Mode isn't part of the Android version of the app anyway. Still, those toting a phone using Google's open source OS like to take videos and still shots in portrait mode too, so perhaps that part of the update will be made available for Android users as well, down the road.
source: Instagram via MobileSyrup