When will some of you whiners realize, Apple makes battery improvements to the iPhone by improving the power efficiency, not JUST by increasing the battery. And with Apple supposedly looking to build their own baseband chips now, that's even more evident the intention behind it is to create a more energy efficient radio (the biggest source of battery drain).
Just because the phone is getting way thinner, doesn't mean battery life won't improve. I predict the opposite. The battery will certainly get larger, it's thinner but volumetrically will have more room for battery than the 5. The A8 will instead focus on power efficiency rather than raw power, after the A7 already accomplished that last year. The display technology will be new and more energy efficient.
Just be patient and wait til you see the damn phone. Don't jump to conclusions. Battery life has always been a high focus for Apple, more so than competitors. They didn't jump on the LTE bandwagon at first until their energy efficiency was solved, they always focused on the performance-per-watt in CPU design, among many other things. Apple prioritizes battery life. It isn't a one or the other argument. Apple can have both beautiful and thin designs while also having industry-leading battery life (see MacBook Air and iPad Air)