Apple has confirmed that it will begin accepting online pre-orders for the iPad at 5:30 a.m. Pacific Time/8:30 a.m. Eastern Time tomorrow, TUAW reports. According to Apple’s prior announcement, U.S. customers will be able to pre-order both the Wi-Fi-only and Wi-Fi + 3G models of the device, or reserve a Wi-Fi-only model for pick up at an Apple retail store. Apple will officially launch the Wi-Fi-only version of the iPad in the U.S. on Saturday,…