No, power draw would be much less on the WiiHD.
I read the box for the next Wii was more comparable with the japanese and european version of SNES.
In design or look maybe. What I heard in terms of size was that of original Xbox 360.
And why would power draw be less on Wii2. Even if chips are same 45nm, wouldn't ramping up the speed create more heat and draw more power.