There's not a ton to see here, as the phone just looks like an iPhone 4. But the person shooting the video does run some benchmarks, showing that Safari will run just about twice as fast on the 4S as it does on the 4. Not too shabby!
They also take a peek at Siri's settings, including the option to have Siri automatically work when you hold the phone up to your ear.
We'll be seeing plenty more on the iPhone 4S when it comes out later this week, I'm sure.