I don't doubt a new console is coming and I'd bet good money on it coming in 2012. Click on my name and read my recent post (Which have largely been about this subject) and you'll see I'm among the people predicting this is coming.
Just the same, it's still unofficial and we don't know what, if any, of these details are true. Even the part about significantly being more powerful than the PS3 and 360 might not be accurate, although I think it makes perfect sense to expect it to be a good bit more powerful.
We're still solidly in the rumor stage at this point. And doesn't it seem at all odd that one site announces a rumor and suddenly within hours, every site out there is seemingly coming out with rumors of another facet of the WiiHD?
Seems likely that at least a healthy portion of what we've been reading over the past few days could very well end up being false. Proclaiming anything as confirmed until they're actually confirmed is just misleading at this point.