Awhile back AMD was having trouble reaching the speeds it want to achieve at the voltages it wanted on the upcoming 65nm process. The 1.4v operation is not a problem, and were told the first generation of 65nm parts are set for 1.35v, so if they had to go up to 1.4, well it is not a problem worth noting. (1.4^2)/(1.35^2) ~= 1.075, or about an 8% increase.
With that in mind, AMD already have plans for the new 65nm coming out early next year that will dramatically drop voltage and wattage consumed, leading to quad core parts that are on track for the speeds and power AMD promised. Basically, what it comes down to is AMD says they will deliver 65nm parts on time, on power, and in quantity. It looks like AMD appears to be in much better shape than everyone thought. Could be another Intel vs AMD confrontation as they go neck and neck again.