I did some Google searches on battery life on the iPhone 5 with iOS 7. There were several articles claiming this is true. But if you read them, each article was referring to the Ars Technica review rather than conducting their own tests! Hmmmm....

I've read that some upgraders have experienced their settings being reset. If so, I wonder if the Ars Technica guys checked the settings before and after their tests to verify they were exactly the same in iOS 6 and in iOS 7. If not then their tests are not valid.