Man, I'm glad Viper1 beat me to it because I was about to type up a storm. Next year, we all might be lucky to even hear ANYTHING about Wii's successor from Nintendo. The next year will solely belong to the 3DS hands down.
I believe the world will have info (specs, looks, launch games, features, etc.) about Wii's successor during E3 2012 and will launch that following holiday season. Kinda similiar to how the Wii launched back in 2006. And if the successor would launch in 2012 and the Wii is still selling at a pace suitable to Nintendo's standards, then Nintendo can and probably should sell both together, just like Sony is still selling the PS2 and PS3 at the same time.
Nintendo should release the 3DS during the holiday season through March 2011.
During that same period and forward, Nintendo should focus on the Wii's momentum, games, sales, (basically what Viper1 said) etc. just like they're doing now. E3 2011 should be focused on the Wii and 3DS.
In 2012, the Wii MIGHT start to lose steam and during E3 2012 Nintendo might give us some info on the successor of the Wii following a worldwide launch during the holidays IF the Wii starts to weaken around that time.
The truth is we don't know what the heck Nintendo's gonna do, but the only thing we can do now is speculate.
Generation 8 Predictions so far.....(as of 9/2013)
Console that will sell most: Nintendo Wii U
Who will sell more consoles between Microsoft/SONY: SONY
