It is highly unlikely to see any updated displays (I suppose you are thinking at something like a retina 27" display) this year. The update of the iMac suggests that the display is not ready yet for a major change.
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There are 4K resolution wallpapers in OS X Mavericks, and Apple is pitching the 4K display capability pretty hard in the previews of the new Mac Pro. The display alone might cost 3500-4000 dollars though, which is completely ridiculous for an iMac. I look at the iMac as the MacBook Air and the new Mac Pro as the retina MacBook Pro. There can be differentiation.