Chipworks was quick revealing Omnivision OV5650 5MP BSI sensor inside the main camera of the new iPad. This is the same 1.75um pixel sensor used in iPhone 4:
The secondary VGA camera uses Omnivision's OV297AA 3um pixel sensor. The same sensor is used in iPod Nano and iPad 2:
Thanks to EK for sending me the news! Looks like Needham was wrong predicting Samsung sensors in iPad in January.