Hey there Skylord!
Stonehearth is more of a sandbox city building game with RTS and RPG elements, rather than a strictly RTS game. There will be scripted modules within the game that have storylike elements, but the game will be focussed on your settlement and it’s growth. The team have stated that they want this to feel like it’s your world, that you build up the story and the experience for yourself.
They’ve stated in a livestream that they don’t want there to be an endgame, or victory condition as they want it to be a sandbox experience. However with the ‘modules’ it would seem that there will be something like quests that will see you doing and experiencing various things.
I get the feeling that there won’t be a main campaign, as I don’t think it fits in with the game they are trying to make here? Think more Dwarf Fortress rather than Age of Empires.
If I’m wrong I’m sure someone will correct me, and If I’m right … well I can only apologise for disappointing