It seems someone has gotten hold of an iPhone 4S ahead of launch. This video from AppVV.com shows off a new iPhone 4S with some early benchmarks. It also shows the Siri settings interface which allows you to turn Siri On/Off, change Language Settings, Voice feedback, My Info and enable Raise to Speak.
Early Sunspider marks show a total score of 2222.1ms and a BrowserMark score of 89567. For comparison, it appears that the BrowserMark score for an iPhone 4 running iOS 5 is 44856, so the new iPhone 4S benches twice as fast in the browser.