I'd put the average at around 80-85k, an increase of 20-25k/week, and I think it has a shot at doing 120k for two or three weeks if this is heavily advertised and there's a bundle or two. Also, keep in mind that this $299 is for the Premium--they would never make the Premium only $20 more than the Arcade, so the Arcade must be getting a drop, too, probably to $229 or $199. Now THAT would boost sales.
Also, I predict that NA isn't the only place getting the cut.