What i understand from Fugger's post is that there's a Vcore limit after wich the current just goes insane; the fact of the matter is that all the Core i7 results i've seen so far stop scaling around 1.5V, just like Fugger's chip.

Usual current leakage is a different matter though, I also noticed that high-leak parts (hotter chips) usually do well under subzero but it doesn't have anything to do with the 1.5V limit. Low temperature cancels transistor leaks and under LN2 the 1.5V limit, if it would be caused by regular leakage, would be moved much higher or even disappear completely. But instead it remains at the same value, wich proves it is NOT caused by electrons / voids jumping trough the transistor's insulating layer.