I must have missed that. This would be kind of similar to HoI 2. Intelligence/Espionage were only introduced with the Doomsday expansion (anyone wanting to play until 1953?!

).
However, since the concept has already been introduced in a preceeding game, i think that it cannot be simply cut away in any successor. We also have seen quite a lot of screenies which showed espionage options and the ability of staging coups certainly represent a feature many do await from vanilla. Intelligencs techs would also remain futile without a proper espionage system. Regardless of the detail level it might have.