I came across this interview with George Harrison -VP Marketing Nintendo US- over at gamedaily. http://biz.gamedaily.com/industry/feature/?id=16889&page=1
This is actually the published text of an interview that occurred at E3, so the contents aren't exactly late breaking. One of the more intereting points was his comments on the possibility of a new redesigned Wii.
BIZ: I interviewed Perrin during D.I.C.E. and we talked a bit about how Nintendo likes to revise its handhelds. I asked her if this revision model was applicable to console hardware like the Wii as well, and she said, "Sure. You'll see the ways in which we do that." That seemed like a strong hint that Nintendo will revise the current Wii hardware. Is a new model planned?
GH: It's interesting, console hardware has always historically been on a sort of fixed, sequential pattern almost every five to six years and it takes you about five years to develop a new piece of console hardware. The handhelds and portables, like Game Boy and now DS, we've always been continuously innovating, and whenever we feel like it's time or have an upgrade, we'll do it, whether it's an improved screen for the handheld or slimmed down like the DS Lite – those types of things. So it's not out of the question on Wii, but we're not even to our second holiday yet, so it's kind of premature to talk about any revisions to the hardware itself.
I've often wondered, ever since the details of the Wii were 1st announced, if Big N might eventually release a new SKU. My guess is that if this is going to happen it will probably be sometime in the spring or fall of 2009.