There are some rumors across the web that Canon will release two new SLR cameras (5D Mark II and EOS-50) with 3" 'high-res' OLED displays. These might be revealed at the Photokina trade show (September).

More 'details' of the cameras here (DPReview)

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Kyulux - Hyperfluoresence OLED emittersKyulux - Hyperfluoresence OLED emitters