That's a whole buncha GBAs!
According to GameSpot, Nintendo plans to have 1 million Game Boy Advance units ready for the North American launch of the system on June 11th. Nintendo also plans to release 1 million for the Japanese launch on March 21st. After the Japanese launch Nintendo plans to make 1.5 million units a month during April and May and starting in June the company will produce 2 million units a month. Thanks to Onslaught of the Gaming-Age forum for pointing this out to me.