Yes U3 was realtime, also that EA boxing game ( the games were being manipulated) and the tech demos..
The guys I talked to said KZ looks to be real-time also (but obviously scripted). They are using effects that could be made PERFECT on a offline render. The KZ shots are however not perfect, there are signs that show that they are realtime (blurr effects, shadows, lightning, polygon, textures), according to these guys at least.
Also one journo working for RESET said his man over at E3 said he was told they were rendered in real time.