While I have no opinion on when the next Nintendo Console might be announced / released I do think Nintendo need to retain the Wii name for the it's next console. With it's strategy of getting everyone from kids to housewives to hard core gamers into the Wii the brand recognition of the Wii is where things are at with Nintendo now.
Nintendo used to be able to trade on its own name so each new console could be given a new name (NES/SNES being an exception) and it would sell. Sony started with the brand recognition with Playstation, and MS picked it up with Xbox. Nintendo has that one lesson to learn from Sony and, to a lesser extent, MS and that is once you have a console name that everyone knows and wants you don't drop that name and start over again. I really think Sega partly lost it because they didn't learn to pick a brand name and run with it though multiple generations, perhaps Genesis 2 instead of Dreamcast may not have saved Sega from exiting the HW market, but it might have given them a better chance of survival.
The next Nintendo console needs to be Wii, otherwise this one simple thing could mean Nintendo falling back and the next gen will very much be a 3 horse race with no one establishing clear dominance. But quite what they should use to differentiate from the original Wii is the question: Wii 2, Wii HD, Super Wii, Ultra Wii, Mega Wii, anythying but please don't make it a play on words of "we", leave that to the game titles.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."
Jimi Hendrix