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...nor are there any v8 ecoboost engines in development.
The 5.0 is not an Ecoboost engine, nor are there any v8 ecoboost engines in development. The largest currently in the works is a 3.7 upgrade of the current 3.5.
Making the 3.5/3.7 EB available in that car would be quite quick. Not currently planned though.