If the game comes out in 2018, I doubt it. Just moving to a new HD engine is a lot for Intelligent Systems, who I think have only worked on Paper Mario: Color Splash and Pushmo World in terms of HD.
But short of going full hog on a Gaiden/Shadows of Valentia style map system, I can't see FE being able to do something similar to open world, especially since they tried a project similar to that in the Wii era that was eventually scrapped for being too different from the standard formula.







