If you would like to try the terrain deformation in all campaigns early it is live on the Experimental game version branch with in-game version 2.44.0e1. The default settings have been changed to Terrain Deformation on, Fog of War off, map size 120.
You can change your game version in Steam by right clicking Granvir in your library and selecting Properties>Game Versions & Beta>Experimental. Please be aware that you may encounter bugs more frequently on Experimental since it is usually less tested and intended for players that want to try new features early.
If you see anything weird or fail to load a map please let me know. Places like rest areas still need deformation support but all mission maps intended to support terrain deformation should.