Apple has announced that iPad Wi-Fi + 3G models will be delivered to U.S. customers who pre-ordered in time for “late April” delivery on April 30. The new models will also be available at Apple retail stores the same day beginning at 5:00 p.m. As with the iPad Wi-Fi, Apple retail stores will offer a free Personal Setup service to each customer who buys an iPad Wi-Fi + 3G at the store, including helping them to setup email and load apps.…