I just came from a 2 day Ford training school in Richmond. The class was actually on the CVT Transmission, but there was a 6.4 setting there. The instructor {who is very knowledgeable} basically informed us with the same info that HGM told everyone. HGM is telling everyone the correct info.
On another note I found interesting though, at least in our area and the Richmond VA area there is no USLD fuel to be found. Alot of dealers are raising a fuss because they have customers waiting on the new truck/engine combo, but no fuel to feed them.

Alot of the fuel suppliers in the area {at least around Richmond} claim they have no interest in supplying the fuel. I don't anticipate a smooth new model launch at least in the above listed areas.
Another bit of info about the USLD fuel. The 6.0 fuel concerns have dropped dramatically with using the new fuel in testing. You 6.0 owners might see better reliability with the new fuel, at least with fuel related and turbo sticking concerns. Lets keep our fingers crossed.
Donny