I really hope that they will include a USB port. It would add so many possibilities that I think will make the iPad MUCH more user friendly & useful.
I've seen the lack of a USB port talked about as a huge negative, along with the (supposed) lack of multitasking, lack of flash, etc.
I'm honestly confused as to why you would see the need to have a USB port built into the device. (really, I'm trying to understand, please don't take this as criticism.)
There will be an adapter that plugs into the dock connector and provides a USB port for connecting a camera. I would imagine that app designers could find a way to access this for connecting specialized hardware if they needed to, but it's not something you'd want connected all the time.
My confusion stems from trying to understand just exactly what people thing they're going to connect to the iPad on a regular basis... it's a portable, tablet roughly the size of a hardback book. Anything connected to it makes it much less portable. I imaging carrying mine with me almost constantly throughout the day, replacing my Day-Timer organizer.