Whatever the final pricing structure they set, I hope that they don't do what they did last time to us in the UK, and 'add' $100.00 to the price you'd pay in the US, and they also made it technically difficult to allow us to purchase the OS at US prices.
The price should be consistent across territories, and 'less' than Vista 'launch' prices; if MS really want to rid themselves of the 'Vista aftertaste' & encourage migration from XP, then a 'home license' package (One disk covers three computers in the 'Home Group') would be a radical plan to really get Windows7 into the market.
the 'Home Group' license idea would be logical too, given that to use the Home-Group and Remote Media Streaming features, both require your 'Home Group' to be running Windows7 as the OS on all machines!
In these grim economic times, this is the chance for MS to strike a deal with the Consumer....and not the Shareholder.