Who knows what the final chip package will be? There might be changes to that too, but to expect smaller than 65nm - when a few months ago the speculation was that no small company like BFL could afford to go 65nm?
I'm just saying that the technology is already out there. I was talking about subsequent generations, not implying that we should expect anything better than 65nm in the first-gen chips.
BFL themselves have hinted at a move to 45nm chips for the next generation in the Bitcoin Magazine interview.