If BFL uses standard cell, I think they would have to go with 45nm to have chance to meet their spec.
What is the mask cost of 45nm these days?

But I figure they will go with a 45nm multiple wafer run, ie several designs on one wafer to cut down the initial cost.
They will quickly  get delivery problems but now they have proven their product.
I guess the next step is to get enough preorders by then to cover the cost of a full mask set.