Apple launched iPhone 4S today, as expected. Apple discussed in detailed the iPhone 4S specs. It looks similar to iPhone 4 externally but has several enhancements inside. Here is a brief look at specifications of iPhone 4S:
iPhone 4S Specs
Processor: A5 Dual Core processor
Camera: 8 MegaPixels (3264×2448)
Video: 1080p (HD) video recording

These are the enhancements, other hardware specs remain same as in iPhone 4.
Release Date: Apple iPhone 4S will be available from October 14 in the US.