To the OP, did you read the article? If you did, what don't you understand? Do you really think Ford could expect to sell the Fiesta at the price quoted in the article? In addition, the EU Fiesta diesel does not meet our emission standards, and would require even more costly capabilities to do so - so the estimated price quoted in the article would be even higher! And, as mentioned previously, the EU mpg figures are lower than the EPA figures.
I'd really love to see some modern diesel engines in the U.S., but the more I've learned about the issues, I understand the reluctance to commit on the part of the manufacturers.
The idea of a shared diesel engine plant between Ford and GM to overcome the volume concern is a great idea. They've collaborated on the 6 speed transaxle, maybe cooperating on an engine and sharing the plant could be a next step.