I was expecting this to mean that Nintendo was actually increasing the supply, but 1 million in August just sounds like "on schedule" to me. If they launched in Japan and North America in mid-October and produced 1 million per month, that would only be about 3 million for launch. Not bad at all, but not unusually high.
Still, good to see everything is on schedule, this feels like a much less rushed launch than Xbox 360 or Nintendo DS.