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Copied from http://www.apple.com/iphone/features/
Dual-Core A5 Chip. Faster is better. Faster Graphics, App Switching, etc.
Two cores in the A5 chip deliver up to two times more power and up to seven times faster graphics.2 And you’ll feel the effects. Fast. iPhone 4S is quick and responsive, which makes all the difference when you’re launching apps, browsing the web, gaming, and doing just about everything. And no matter what you’re doing, you can keep on doing it. Because the A5 chip is so power-efficient, iPhone 4S has outstanding battery life.
iPhone 4S is great for gamers. The A5 chip pushes graphics up to seven times faster. So games run smoother and they’re even more realistic. And graphics-intensive apps perform even better.
This just might be the best camera ever on a phone. And with all-new optics, it just might be the only camera you need. Because behind every shot, you’ve got 8-megapixel resolution and a custom lens with a larger f/2.4 aperture. Not to mention an improved backside illumination sensor, excellent auto white balance, advanced color accuracy, face detection, and reduced motion blur. It all means that no matter how many people, how much light, and how much action you capture, everything looks exactly as it should. And just wait until you see the photos.
The iPhone 4S camera gives you 8 megapixels — that’s 60 percent more pixels than the camera on iPhone 4. And they’re engineered with a higher, full-well capacity to collect even more light. With more megapixels and more light, you’ll see a dramatic difference in the resolution and details of your images.
 Video recording. In 1080p amazing HD.
Shoot stunning 1080p HD video everywhere you go. With all-new optics, the light is always right, the color is always vivid, and everything will look even better than you remember. Video stabilization steadies shaky shots. And you can edit video right on iPhone and share your lush life as fast as you shoot.
Learn more about HD video | 
