No, I have no example to give for that particular "feature" in a turn-based game.
The fog of war you find in most (every?) RTS games these days behaves pretty much in the manner I described - except it is in real-time.
Extending on my previous post, that would mean that you will have to have two battlescape "versions":
- The "true" battlescape - this is where the actions happens
- The "visible" battlescape that is constructed/updated as your troops discover terrain features/revisit previous visited locations
This would mean that a grenade going out on a previously discovered patch of terrain (but not currently in any soldier's LOS) won't have it's effects shown unless someone goes back and takes another look at that spot.
Hope my two cents make sense