The camera is surely better but 'Siri' seems to be the exciting stuff!

Breaking : Apple intros new iPhone 4s with A5 Chipset Retina display same design as the iPhone 4 (PR)

http://igyaan.in/2011/10/breaking-apple-intros-iphone-4s-a5-chipset-retina-display-design-iphone-4/

Apple Launch­es iPhone 4S, iOS 5 & iCloudiPhone 4S Fea­tures Dual-Core A5 Chip, All New Cam­era, Full 1080p HD Video Record­ing & Intro­duces Siri