Nintendo needs to make the Wii 2 feel more like a natural progression in the console market and less a new system.
If it is a new system the casual market may say I like the system I have and I can play these games without making a large new investment.
So then what does that make the Wii 2? Think more of the DSi type upgrade.
This sound like the second coming of the sega-cd/32x, minor upgrades instead of a new system is a temporary fix and will piss off the fan base when then next improvement comes after dropping money on the wii-i. This isn't a cheapish handheld that breaks, get lost, has multiply sales per household, and has slower adoption rates than consoles so using the same strategy isn't the best solution.
1)All controllers will work with the Wii 2. In fact the Wii 2 controller will most likely be the Wiimote with Wii motion plus already in it. Nunchuk's, classic controllers, Balance Board everything must be compatible with the new Wii. I can see a new sensor bar being implemented for better control, and perhaps a sensor bar with a video camera to add some new elements to game design.
Releasing a controller just like the Wii-mote or using the Wii's add ons is the dumbest thing Nintendo can do. The Wii-mote is blue tooth device, and so will the next controller (probably) so all Nintendo need to do is add the drivers to receive data off it allow people to use it for game that work well with it. The new controller need to be some thing completely different
like a wavebird with motion sensing and better suited for games types that the Wii-mote currently can't do well. (Not to mention the loss sale of new controllers, business wise)
2)Complete backwards compatibility. The Wii 2 needs to have the virtual console transferable, the Wii games playable and everything work for the new system. Gamecube support can be dropped however. And a much larger internal memory for storing everything.
The way the system is designed on the Wii as of now, there no real way to easily track your VC sales (ie you format; it's gone). And just coping the game tickets from the Wii to the Revolution 2 would allow for a piracy nightmare for Nintendo, people doing multi-transfers, or if it erases the tickets after transfer people crying over not being able to play their VC games on their old system.
There no point to drop GC support. If the CPU can be used as a Wii CPU then it is fully capable to play GC games. The GC port and MC card slots can be remove and replace instead with a USB or wireless adapter with the ports/slot for those who want it.
3)I think the biggest change will need to be a new O/S that allows for a Nintendo experience similar to the Xbox live experience. This will be the big selling point for the Wii 2. And will go along way to help Nintendo establish the system. Though the channel layout needs to still be there.
Even though they should have a standardize (sane) OS that designed to let new features to be added as extension to the central OS that would allow Nintendo to pull a Xbox live experience like MS did, Nintendo software engineers are
way too stupid to be able to code it. Most likely, they will do the same idiotic moves painting themselves in a corner and make a OS system like the Wii's that isn't designed to be upgraded beyond the level of adding a clock to the main menu or features they only have planed originally
before release like copying save to SD to give the illusion of upgradable. Anything more would require them to overhauled the OS in such a way as to break compatibility with previous released game. And Nintendo likely wont be willing copy their losing competition or admit their mistakes this round.
4) Finally, the system needs to be more power. HD ready, and with enough RAM and horse power to take the Wii experience to the next level. Does that mean it will be up to speed with the PS4 or Xbox 3? No, probably not...but if the system has enough horse power to by an Xbox 360 1.5 then it will be good to go.
How could more power make games better? This in Nintendo, Game play >>> cut scenes. Being HD wont make the game better as a the horse power that's added will just go into turning 480p into 1080p. Until Nintendo can't make the games at a level they want there wont be a upgrade. I guessing there wont be a revolution 2 to at lease 2012/2013, if not later.