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Here is more information to chew on. The 3.5 ecoboost is going away from Ford platforms in 2020 as the new 3L twin turbo replaces it.
Extrapolating this, it makes sense the 3.5 ecoboost is entirely going away and a 3L doesn't make sense in the F150. This means the 7.3 is most likely the replacement. 17-19 Raptor owners are going to be angry.
They already have a 2.7L in the F150