I'm interested to see if Donkey Kong Country damages Other M's Christmas sales or not. It'd be pretty bad if Other M didn't go up even a little bit around Christmas.
Edit: Kotaku may have just assumed Reggie meant US sales. There isn't any direct quote to prove he meant US. If he REALLY meant "close to half a million in the US" alone, then he is either using "close" loosely, or Other M is under-tracked in the US somewhat. However, NPD data suggests that it is actually over-tracked -everywhere-. This is why I think he meant worldwide sales rather than US alone.
Speaking of Twilight Princess, I think Link's Crossbow Training is undertracked here at VGchartz, since Nintendo stated it has sold more than the Wii version of Twilight Princess in the US.