Apple Inc (NASDAQ: AAPL) unveiled its long rumored iPad in January. The device is now available for pre-order and is slated to ship on April 3rd, but customers that ordered accessories along with their iPad may be disappointed to find out that their iPad add-ons may not arrive until May.

Currently Apple is allowing customers to pre-order five accessories for the iPad, including a dock with a keyboard, a standard dock, a case, a 10 watt USB power adapter and a VGA adapter.

Apple announced yesterday that it would be delaying its ship-date of the iPad keyboard dock and the 10W USB power adapter until sometime in May.

According to the Apple Store, the standard iPad case will ship in mid April.

Only two of the slated iPad accessories will ship on the same day as the iPad, including the iPad dock and the iPad dock connector to VGA adapter.

Another accessory that was demoed but is not available for pre-order was a dock to USB connection that would allow photographers to off-load photos from a digital camera onto the device. Apple has not stated when that accessory would be available for pre-order