Fords most likely course if action:
2018 will have a new wheel option and a color option. Headlights will be improved. Overall cost will increase by roughly 900 dollars.
2019 will OFFER the revised 5.0 as a lesser option to the 3.5 eco HO. The engine will have slightly higher advertised HP/TQ numbers than a regular f150 although there's probably no actual difference it will get similar mpg.
2020 will introduce a special edition that has a new interior and special wheels and exhaust. The tech package will have auto pilot.
2021 refresh of exterior, 5.0 will be dropped and the 3.5 eco HO will come with 475 HP/525TQ.
2022 no change.
2023. No Raptor to ever be offered again.
It's thus recorded for ever. Let's see how accurate I am.