Apple today announced iPhone 4S featuring dual-core A5 processor, 8-megapixel camera, Siri and 1080p video recording. As it was rumored the iPhone didn’t see any major redesign externally, but a complete system overhaul internally.

“iPhone 4S plus iOS 5 plus iCloud is a breakthrough combination that makes the iPhone 4S the best iPhone ever,” said Philip Schiller, Apple’s senior vice president of Worldwide Product Marketing. “While our competitors try to imitate iPhone with a checklist of features, only iPhone can deliver these breakthrough innovations that work seamlessly together.”

One of the feature that Apple highlighted most today was Siri, an intelligent assistant that helps you get things done just by asking. Siri understands context allowing you to speak naturally when you ask it questions, for example, if you ask “Will I need an umbrella this weekend?” it understands you are looking for a weather forecast. Siri is also smart about using the personal information you allow it to access, for example, if you tell Siri “Remind me to call Mom when I get home” it can find “Mom” in your address book, or ask Siri “What’s the traffic like around here?” and it can figure out where “here” is based on your current location. Siri helps you make calls, send text messages or email, schedule meetings and reminders, make notes, search the Internet, find local businesses, get directions and more. You can also get answers, find facts and even perform complex calculations just by asking.

Other than Siri, the second most talked about feature of iPhone 4S at today’s Apple event was its 8-megapixel camera. Apple says that it has 60% more pixel and can capture 33% more light with its larger F/2.4 aperture lens and hybrid IR filter for sharper brighter and more accurate images. Apple also claims that the new camera on iPhone 4S is the fastest on any smartphone. It can also record 1080p video with image stabilization and noise reduction.

Apple has also improved the dual external antenna design in iPhone 4S with intelligent switching between two antennas to send and receive data. The iPhone 4S offer 14.4Mbps download speed and 5.8Mbps upload speed. It is now a world phone, as it supports both CDMA and GSM networks.

iPhone 4S comes in either black or white and will be available in the US for a suggested retail price of $199 for the 16GB model and $299 for the 32GB model and $399 for the new 64GB model. iPhone 4S will be available from the Apple Online Store, Apple’s retail stores and through AT&T, Sprint, Verizon Wireless and select Apple Authorized Resellers. iPhone 4S will be available in the US, Australia, Canada, France, Germany, Japan and the UK on Friday, October 14 and customers can pre-order their iPhone 4S beginning Friday, October 7.