You have outdated info,
You have outdated info, Patrick... Only 4 out of 10 preorders result in actual LEAF sales and Nissan promised a few months ago to only bring eight thousand units by the end of September 2011 effectively satisfying everyone on the list.
Those ~600 April LEAFs left Oppama one day before the earthquake in March, so they really got lucky. May numbers may match April but it will be a challenge for Nissan since the factory was offline for over two weeks. June and beyond is when it will really start picking up and I'm hoping for mine in August/September...