I got to the SoHo store at 6:20AM this past Tuesday (4/5) to a fairly large line. I would estimate that I was somewhere between #50-70. By the time the shipment arrived at 7:30AM-ish, the line had stretched down Greene St., ending almost at West Houston St. Soon, the staff did their "what-iPad-would-you-like" thing, and announced after a few minutes that there were no more WiFi or AT&T iPads left to us further back in line. They did have Verizon iPads.
Unfortunately, the only people who got iPads were scalpers. I would say there were at least 30 of them.
I was able to get a white 64GB WiFi iPad at Tekserve around 5PM today (4/6). They had a few white 64 GB WiFi iPads in stock when I left.
The 23rd St. and 6th Ave. Best Buy had only 64GB Verizon iPads (not sure which color) as of 5PM at 4/6.
A family member has mentioned that usually there are "a lot" of people camping overnight at the 59th St. Apple store.
A little further out from NYC, the Roosevelt Fields Mall and the Manhasset Apple stores only had Verizon iPads left when they opened as of 4/3.
Hope this helps!