Apple has dropped its estimated shipping wait time for new orders of the third-generation iPad. Apple’s online store shows that the estimated shipment wait for all models—including both black and white variants of either Wi-Fi or Wi-Fi + 4G models, across all capacities—is now 1-3 business days, down from 3-5 days. The changes appear to apply only to the U.S. and Canadian stores, as the company’s European online stores still show a…