Apple got by with eight megapixels on the iPhone 6 and 6 Plus cameras because they reproduce colors accurately, perform well in low light and focus quickly and accurately. The new models don't sacrifice those qualities with the extra resolution, thanks to an improved sensor and faster A9 processor, according to Apple's Phil Schiller. He said, "The goal was to add pixels without degrading quality," so the sensor has not only 50 percent more pixels, but also 50 percent more focus pixels.
Meanwhile, Apple said it's doing 4K video in a different way than most manufacturers by capturing every frame discretely at a full eight megapixels -- rather than capturing the differences between frames. That should result in video that doesn't break up when the shooter or subject is moving. However, it'll also make for very large files, so if you're looking at a base 16GB iPhone model, 4K video could eat up your memory quickly. You also won't see those extra 4K pixels on a new Apple TV, which is limited to 1080p HD playback.
For selfie junkies, the front-facing camera has been upgraded to five megapixels, a big jump from the iPhone 6's anemic 1.2-megapixel camera. Apple also managed to bring a "flash" to the front camera, via a clever cheat. It turned the iPhone 6s' Retina display into an illumination system, a feature that Apple calls the "Retina flash." When you take the shot, the display lights up to triple the brightness, providing enough illumination for your face at arm's length.
Earlier, Apple launched a 3D Touch feature on the iPhone, and it works with images via a feature called "Live Photos." The camera has the option turned on by default, so when you take a snap, it extends capture for a few seconds after you hit the shutter. You can then "force press" the screen on your shots to see motion and hear sound. Apple also gave its Watch some love, letting you use the Live Photos as an animated watch face. Other apps, like Facebook, will eventually support the feature, too.
The 4K video and images we saw at Apple's event looked great (below), but we'll reserve judgment until we can try the cameras for ourselves. You can read our hands-on for both new iPhones, and don't forget to check our liveblog for more info.
Get all the news from today's iPhone event right here.