- 60Gb Hard Drive - not flash memory, won't help it in faster loading times, but Nintendo won't do it as it'd lose their crappy casual crowd.
- Wii Keyboard - would be great for Internet Channel, but Nintendo won't bother. :/
- HD support and at least Blu-Ray support - Sony doesn't own Blu-ray, they only have shares in it - so Blu-Ray would be great (but the rumour made it impossible) - but some sort of HDMI Port adapter to connect to Wii's AV IN port would be great, but no. The Wii's too weak to handle HD.
- Better development techniques - Yeah, Super Mario Galaxy and Brawl look great graphically, even on-par on PS3/360 games but these are in-housed projects from Nintendo. Third-parties are making absoultely crap-looking games, so like what Sony is doing with devs through Playstation EDGE (a method to make great looking PS3 games), Nintendo should release a kind of program that updates regularly for developers to make great Wii looking games, and also improve the Remote and Nunchuk control.
- A REAL Online Channel - should be like Xbox Live.
My five pence.