Cornfields which ruffle in the breeze (and can be set alight!). Infantry legs are hidden and vehicles flatten it. Then again this sounds like coldtech mk2 and we know how that turned out
That corn field part would be amazing... So in fact it is already possible with the current Essence Engine only with snow but this is implemented so poorly, that nobody can recognize it. Also vehicle tracks in Africa's sand dunes would look amazing.
The only thing that needs to be clearly said that this should be ONLY COSMETIC. We all know that Relic senses some gameplay stuff behind that like you can cameo in the field and you have to move fast in the desert in order not to die of thirst.
If you read that, fellow Relic employer:
WE. DO. NOT. WANT. GIMMICKY. GAMEPLAY. MECHANICS.