There almost certainly won't be a "Wii HD", or even a "Wii 2". Nintendo has wised up on the pitfalls of releasing a direct successor to a disruptive console since the SNES managed to barely hold its own against the Genesis. To revert to that strategy would spell disaster for Nintendo, since Sony and Microsoft would leap on them like ravenous wolves and tear Nintendo apart by totally outclassing whatever direct Wii successor came out.
The only reason they have not tried to bring Nintendo to its knees with a Wii-alike is the simple fact that they would be investing in hardware that would be quite likely to not sell at this point, given that the current hardware cycle is still so young. And that limitation will not be upon them in another 3 or 4 years when people are "expecting" another cycle of consoles to begin, this time in the same vein as the Wii's control setup.
Sky Render - Sanity is for the weak.
