a bigger screen, so perhaps it could roll out or fold out?

If I could fit a laptop into my phone and have the screen fold out twice so it had 4 times the area, then this might be the gadget I want.

The ultraportable-to-pocket PC segment is highly personal to the user. People have different sized pockets(!) and different requirements for what they want to do with the thing and how long the battery life and other competing factors should be.

That means a one-size-fits-all solution does not exist and more models will allow people to effectively "customise" the machine to their liking.