Well it is kind of official: The 7.3L gas engine is
in the new Superduty Pickups.
Looks like Ford lifted an embargo on the trucks and engine as there are a bunch of
articles about it now (doing a limited search of the past few days I see a ton of articles similar to the two I've linked here).
Edit:
Here is Ford's page on the 2020 Superduty Trucks.