Bingo...this obsession with thinness its getting us nowhere - keep the freaking thickness/size the same as the 4S and put it on 4.7 chasis and you will see a 12-20 hour talk time and standby in a week or more.
No much hope - you know they will claim the thinnest in the world for the iphone 6 - bummer.
No you won't. Because in that case Apple would put more powerful hardware inside the phone that would make the battery life more or less the same. They could have improved battery life almost 10 fold by now simply by not putting in more and more silicone. But the current battery life is accepted by the masses, meaning that any bigger case would result in the same battery life but faster microprocessor and more memory etc.