I also find it interesting the BBC Television Center in London is getting it's own iPad 2 event, at the exact same time as the Yerba Buena center one in the US. The UK BBC One is 6pm GMT, and the us is 10am PST, which are the exact same time. And Stephen Fry, a british television presenter and actor who is an apple lover is presenting the BBC conference for the launch too.
The two events are quite clearly going to interact with each other, perhaps a FaceTime HD Conversation ? Or maybe they are going to say "It's available everywhere, right now".
Has any other apple product had a launch event in the US and UK simultaneously ? I don't see why Apple would pull off such a stunt if it was such a modest upgrade.