Definitely a Camera, and secondly Bluetooth technology so you can send files with ease and such. Hopefully it has a nice sized screen so it can have a decent web browser also. And while we're at it, why not a high intensity laser to save you when you're in trouble?
I am hopeful that the screen will be decent sized for web browsing also, that is one of my biggest pet peeves with most of the phones out there. I would like to see someone intergrate a wireless keyboard through bluetooth to make surfing the web easier. I think that a mini keyboard would be awsome.