Unfortunately, even after the release of Red Faction, totally deformable terrain/maps have not made a comeback. Destructible environments almost disappeared after the release of Red Faction, and nowadays, it's all about "destructible environments" which focuses on destroyable buildings and assets in the map, but not the terrains themselves(Mercenaries, Crysis, etc.)
Deformable terrain, discuss!
Deformable terrain, discuss!