A quick glance at Apple’s online store tells us that customers who want to place orders for an AT&T 4G iPad won’t be receiving them at the same time the iPad makes its debut. Shipping times have already fallen to March 19th from March 16th, something we all guessed would happen by the fact that Apple’s entire site and online store ground to a halt yesterday. Verizon 4G iPads will still be delivered on March 16th, though we believe that will change soon as well. Apple’s new iPad starts at $499 and will be available to purchase in stores on March 16th.

UPDATE: It looks like only 16GB and 64GB AT&T 4G iPads are sold out in white for the time being. The 32GB version will still ship for delivery on the 16th, as will each of the three models in black.