Bing
I'm not even game to go fishin' or stand in the backyard in case of a terrorist attack with curare dipped arrows dropped from a marauding UAV - you have converted me to fear of attack and I have pulled out my 1942 copy of the Air Raid Warden's Handbook
But, in the world of reality, yes UAV will have ADS-B - although it will of course be turned off should they be in hostile territory at war.
try
Avionics Magazine :: Europe’s Answer: UAVs in Controlled Airspace
And, no, I did not read the thread re airspace closures overseas for UAV - I cannot see the need for such measures.