That's right!
Modders can now add/change map textures on any map with ease without messing with the default files.
Simpler than using the -mod command (which doesn't affect map textures at all)!
With this new feature you can:
1. Make mecha mods look more futuristic.
2. Make WWII mods look more classic.
3. Change all default maps to fit-in with your mod.
4. MORE! (No limit to your imagination)
Simply put, it can now give old maps a new look and maintain compatibility.