Something that I miss from the original FA games are vehicles. The early quests revolved around acquiring parts to repair a car. In FA Tactics, you could acquire a whole fleet of vehicles. The APCs scattered around Boston would be perfect. Like FA Tactics, the vehicle would park at the edge of the mission area. Perhaps it could be a campsite similar to Dragon Age. The mission areas would range in size like the various zones in FA4.
Vehicles allow a campaign over a larger area. Tactics went from Chicago to the Rockies. An untapped region to use would be Texas, Oklahoma and New Mexico. This could bring a return of conflict with Ceasars legions.
Power armor should revert back to a mid to late campaign item, without the restrictive fuel requirements.
Let's hear your ideas.