My own wish list revolves around a scenario rather than specific technologies.
I want to be able to toss a tablet, a mouse and a keyboard into my backpack. I'll use the tablet in its default state as a standalone device for consuming content.
When I need to get work done, I'll tell the tablet to connect to the keyboard and mouse. The tablet will automatically know this is "work" mode, so it'll allow for key-command program switching and mouse-based input/editing. In essence, it'll become a mini-laptop.
When I unlink the keyboard and mouse, it goes back to its normal tablet state.
I've toyed with the idea of traveling with my iPad and a bluetooth keyboard, but I know that's not going to cut it. And it's pretty easy to toss my travel machine (MacBook Air) into a backpack.