My dream scenario begins at E3 '12...
At E3 announce that GTA5 and Bioshock Infinite will be launch games (or launch window upon release) and incorporate unique features via the tablet (Infinite to include optional pointer control). Also a name change (Wii 2, Wii HD, or Nintendo Stream), and confirm two tablet support.
Launch details:
Launch in September in Japan and NA, October in Europe and Australia. Price it at $349.99 with the console, one tablet controller, an HDMI cable, and a unique, addictive pack-in game (announced at E3) with the appeal of Wii Sports that shows off the tablet and streaming functionality.
Stand alone tablet controllers sell for $89.99 and come with the E3 demos we've already seen (Chase Mii, etc).
Re-launch the Classic Controller Pro wireless for $29.99.
First party day one launch games: Super Mario Bros Mii, Waverace. GTA5 and Bioshock Infinite among the 3rd party launch games (or launch window if not released yet), along with the already known games (Darkness 2, Batman AC, Metro, Aliens, Ninja Gaiden, etc).
Launch window games (by year's end): Pikmin 3, new Wii Sports, and possibly the new Retro game. Resident Evil 6 and COD among the 3rd party launch window games.
2013 details: No way of knowing, but definitely have a new Wii Fit sometime in 2013 and launch the new Mario Kart against the NeXtbox.