No. Clearly they built a ton of them before launch if you look at how fast they are rolling them out worldwide vs. how slow it was in previous years. But I won't be surprised if delivery time slips by end of week once the news stories of the new iPad satiate the airwaves, Facebook pages, and twitter streams.
Well they knew that they were going Retina display at least 1 year prior to now. Remember the rumors in early summer 2011 that said fall iPad HD update? Even if they didn't have the guts finalized, they probably could have started making the displays waaaaay in advance. Probably the most difficult part of the "new" iPad, so building a more or less identical machine should have allowed them to make at least a million for launch. Probably 4 million for launch around the world, 1 million for USA.