Well, Zelda OOT have sold 450,000 first week (with USA help) but it is released when 3DS was a seriusly little user base, less than 3m, now is at ~50m.
Actually MM have ~200,000 Pre order for ioi in the US. (50,000 only last week)
Also, Majora's Absolutely dominate the Amazon US.
What do you Think?
My prediction is nearly 1 million ( some like 900,000).