Apple has updated its individual retail store web pages to indicate that its U.S.-based stores will be closed later today from 4:00 p.m. to 5:00 p.m. local time to prepare for the launch of the iPad with Wi-Fi + 3G, which will go on sale when the stores reopen at 5:00 p.m. Unlike the launch of the iPad with Wi-Fi, no advance reservations were taken for the Wi-Fi + 3G models, so purchasing will most likely be done on a first-come, first-served basis.…
