some boards go with the "different colors" scheme with their pairs, but I will also venture a guess that it's DDR3 because the notch seems to be more offset from center than DDR and DDR2, plus if they're gonna try to harness the power of OMFGNEHALEM!!!!!!!111uno!!!UNO!!111!!!iCHI!!!11iCHI!!!!!!11!!!! it wouldn't make much sense to run DDR2, I could be wrong though...
I wonder which company will be the first to announce their LGA1366 cooler...?