People keep posting pictures of the Wii U as if the redesigned Wii was the one that looked similar to it, instead of the other way around.
The only differences are:
1) Text rotated 90 degrees
2) Gamecube ports removed
3) Silver colored base not being used (possibly removed)
I mean, if there's confusion to be expected, it would be from the Wii U's design being too similar to the Wii, not that the Wii 2nd Gen looks too much like the Wii U. But if you meant that they're standardizing to make it cheaper to produce the Wii U by tweaking the Wii's design? I guess I could see that, though they're different enough I suspect they'd need to significantly retool the production line, regardless. (square versus rounded, for example).
Personally, I don't expect that we've seen the Wii U's final design, anyhow.