I doubt (and I have been wrong before) that the 3.5 ecoboost will find its way into the Superduty. The reason I say this is because the EB has more horsepower and torque than the old 5.4 V8 Triton that was in the Superduty for over a decade. When that engine was discontinued in 2010 (I believe?) why wouldn't ford have thrown the EB in the Superduty if they thought it could stand up to demands of a heavy duty truck. It is one thing to hook up to a heavy RV 15 times/year and make the EB work, but very few 3/4 ton and 1 ton pickup trucks are purchased to pull a RV as many on this forum purchase them for. They are purchased by businesses that pull up to their GCWR daily. And in that instance I don't think the 3.5 would last for the 200,000 miles that a fleet manager would expect from it and I believe Ford knows that.