It has what I want. Improved camera (especially image stabilization in video mode), and faster at loading games (and probably useful apps too). I don't care much about Siri, but then I didn't realize how amazing Maps was on a mobile phone until I had it myself.
I suppose I also had a good idea about what would be announced thanks to MacRumors accurate reporting, so I wasn't let down that the phone is called 4S instead of 5 (besides, I love the iPhone 4 external design).
I never used voice recognition on mobile until my wife picked up an Atrix and there was a little mic button on the home screen, I clicked it and said direction to Hatteras Flats and it pulled up Google's turn by turn navigation. From that day on, I have been waiting for that level of voice recognition to come to the iPhone. I would have never though that it would have been such a killer feature and now I feel like I am in the stone ages without it. To the point that I was considering switching if IOS 5 did not have it.