But this will only make a difference to people that wish to pack hashing power into a datacenter, really. Hobbyists should still be thinking along the lines of "28nm of what?".
even in a datacenter Three antminer S1 are is faster than a KNC jupiter, and I believe they take up less space (if not less, it's close I don't have the dimensions of the KNC handy). yea, sure they involve more chips... but they are low power so they can reach reasonably high chip density in a single unit.