Apple is making the 5 larger, but not too much larger. Why? The limits of current battery technology would make a larger screen phone largely impractical in terms of the size of smaller human hands and existing battery technology.
Yes, but Apple made it worse than it needed to be. They're so obsessed with making the phone as skinny as possible that it limits it's battery life (not to mention how fragile the thinness makes the phone), but could have kept the same thickness of the 4S (which is already thin) and really fattened up the battery.