Automakers getting clever about disguising development vehicles isn't anything new. Between mules wearing the sheetmetal of other cars and prototypes decked out in as much camouflage as is practical, automakers know how to make it very difficult for the general public to get an exact idea of what kind of vehicle is in development. Ford, though, is rapidly becoming the master.
While I do not question that biodiesel is a cleaner fuel than standard diesel, I don't think I'd dive right in to the smell of it burning in an engine the way that Portland, Oregon construction safety coordinator Dane Brewer (of Anderson Construction) does in this article. Libby Tucker, wrting in the Daily Journal of Commerce, starts with the image of Brewer going up to a forklift's exhaust and "taking a big whiff." I sure hope it was burning B100.