> I suspect the answer to cheating will ultimately be big brother and hiding information from the client.

The speed of light makes this _marginally_ problematic to do. It is possible that a unit might move out of the fog of war, or out of cover, during the latency to the client (or between server ticks). You'd effectively have pop-in during some scenarios - but it would be minor and the net benefit would probably make it worth it.

I recall one of the MOBAs adding this during its lifecycle, HoN I think?