Reggie says: no.
Quote kotaku:
Speaking on GameTrailers TV, Nintendo of America's Reggie Fils-Aime has, with a smile and some stern words, crushed into tiny, tiny pieces the prospect of a HD revision of the Wii. Chatting with host Geoff Keighley, Fils-Aime said of the rumour,
long kicked around by analysts and
members of the press:
Reggie: Michael [Pachter] continues to be the only one who believes that this is gonna happen. I don't know how forcefully we can say there is no Wii HD.
Keighley: It's not coming, period?
Reggie: No.
Well, that's that then! There is no Wii HD. Just...
something with a different name.