The Due will continue to work with all Arduino shields -- add-on boards and circuitry like motion sensors and LED light arrays -- that conform to the official Arduino Revision 3 layout. However, the Due operates at 3.3V whereas AVR-based Arduinos operate at 5V, meaning some third-party shields that don't follow the R3 specs to the letter may not be compatible, depending on their voltages. http://www.wired.com/design/2012/10/arduino-due/
Well, that would explain why some "third-party shields that don't follow the R3 specs to the letter" might exist, then.
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