It seems logical that the Foxconn factory is producing and shipping iPad2s by the storage capacity, and probably according to wether it is Wifi only or includes 3G. This is a guess, I have no inside knowledge on this......I've been monitoring this thread and been feeling very disappointed that my order placed at 1240a PDT on 3/11 for a 64GB white iPad2 3G (AT&T) had remained at "Not Yet Shipped" while other orders (mostly different configurations) had already arrived. As of right now, my order has finally changed to "Prepared for Shipment" with a delivery estimate of 3/18-25. Very happy right now.
If you look at the pattern in this thread (I know, not very scientific and prone to sampling error), it seems like the majority of folks who have already gotten their iPad2s are Wifi only, Black color, and less than 64GB models. Someone earlier speculated that Foxconn is devoting several production lines at a time to output large batches of certain models at a time. Seems like there might be something to that theory. I'm going to go out on a limb and speculate that the Verizon 3G models have been shipping sooner because of low demand. Verizon only accounts for about 13% of all iPhone4 users - probably because the GSM model can be used around the world (with some "modification" of course). I loved being able to swap-out the microSIM on my original iPad when visiting my parents in the Philippines last year.
Good luck to everyone still waiting. If you ordered a white 64GB 3G before 1a PDT on 3/11 like me, hopefully you are also seeing some movement in your order as well? Cheers!