Yes, I personally got the shipment notification late in the day. 7:30pm on April 5th Got the phone on April 6th. Others though got their shipment notifications earlier in the day. The people that pre-ordered in stores in the lumia 900 thread I was following got their shipment notifications and everything last.
That's just like a lot of other people have been saying, some of the phones may be shipped tomorrow with one day shipping. Maybe it's just the way to lighten their load for a day.