Better gesture integration for iPhone would be great. For example, in a similar idea to the google mobile iPhone app a flick from the bottom to top of the screen would show categories. Also, a pinch to zoom to go into full screen feed mode.
Next, social network integration. In a similar way to flipboard, I could view stories of friends on my iPhone. (it wouldn't be considered a copy cat of flipboard as there is currently no flipboard app for iPhone).