We've seen a few R680 running and we can confirm that each card was incredibly cold during Call of Duty 4 or any other game or operation.
Wee expected that the air would be very much warmer, but we've been told that Power Play helps these chips a lot, especially in idle mode.
Still, don't expect a passive cooler. It is a dual slot card, but we are quite sure that it should be cooler than single slot single G92 8800 GT. We' expected more heat from it, but we guess RV670 is very mild when it comes to producing heat.
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R680, Radeon 3870 X2 run cold
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CES 2008: Shocker