If that's all we get, I'll be extremely disappointed. There's no point in designing a controller with a 6 inch screen in it only so that people can put HUD information on it. That would be a huge waste of resources. Hopefully Nintendo has thought this through well enough.
If no one but first party developers use the screen for something substantial, then this was probably a big mistake.
Edit: I'm not against some games making minimal use of it, but if the majority does, I don't see the point.
I think it'll have a good variety of uses really...
general utility:
- use Wii-U as handheld for old Wii games or new Wii-U games
- playing touchscreen apps and games, drawing etc.
- use of the camera in apps and games (hopefully they add an outer facing cam too), video chat etc
- web browsing, using the screen as a zoomed scrolling window to the page that's on the TV.
- browsing media on the tablet and flicking them to the TV screen to share with a wider audience (this was shown in the unveil video)
- maybe something surprising like DS emulation
- possibly Universal Remote functionality
in games:
- asymmetric gameplay and alternate viewpoints, examples: first person display on DRC when held up, aliens scanner, detective-mode in Batman, gameplay view on DRC / cinematic view / replays on TV, etc.
- use of gun shaped remote holster to turn it into a gun with scope, think new gen Super Scope / Silent Scope.
- inventory / map / HUD
- persistent OS messages and notifications
- drawing gestures, think Kirby Canvas Curse, LostWinds, Yoshi Touch & Go, Osu! Tatakae! Ouendan / Elite Beat Agents, Mario Paint, Colors 3D, Brain Age, Swapnote etc.