Good call stof *thumbs up*
I think FireRed and LeafGreen had less than half of this number of pre-orders, plus you hear everywhere that a lot of people who have DS's played Pokemon Red or Blue and haven't played a game since then.
Also, the US buying style is completely different to japan (whoever said the 3:1 first day thing) buyers will be buying this game MASSIVELY for the rest of the year with Christmas being even bigger...
Thinking about the future prospects for the DS I just can't picture how absolutely astronomically massive this year is going to be for DS, Wii and Nintendo.
500,000 pre orders for a game that is typically not only just a hardcore gamers game but a very broad spectrum game for many many people is simply staggering and cannot be spun in a bad way at all. I don't know if they will reflect well in the april numbers because it comes out so late in the month, but 1.5 mil is HIGHLY likely.