Not actual .wav file speech, just modified the existing "speech" file which contains the text that comes up when you interact with a race. Although I did suggest to MM that a way to make the races more memorable would be to play a short, distinct .wav file for each race when you click on their picture to communicate with them or they send you a message in the log.
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No bastard ever won a war by dying for his country. He won it by making the other poor dumb bastard die for his country.
-General George S. Patton
Simulated Speech? How about a National Anthem? The diplomatic screen is a good place to add some game detail, though, whatever it is. I'm still waiting for the Technological Espionage data to be added to the info on the diplomatic screen like info acquired in combat is.