OLED is still backlit, at least all versions I'm aware of are backlit. Many phones inlcuding the new Google Nexus One use OLED technology and I am sure all of these are backlit.
There is an updated article at Engadget with some additional details including that the display is actually 5.7 inches. This is the same size as mentioned for the commercial mirasol display. Could this be the first production device with a mirasol display? That would certainly contribute to a longer battery life as opposed to OLED.
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