Juli Clover at 9to5Mac:
Along with the features that were demoed on stage, an iOS 8 graphic displayed some additional functions that went largely under the radar, many of which look quite interesting. For example, iOS 8 will apparently display battery usage by app, a handy feature that will let users monitor the battery drain of specific apps, shutting down those that are drawing too much power.
I’d really like to see how the current Facebook app does in this graph.