Any changes to espionage? I'm really not liking the way it is right now.
Oh yes, please give us back the possibility to do "passive" espionage like in DL. Or, if that's too difficult to integrate with the current DA system, give us the possibility to place "dormant" agents, that just would gather intelligence and wouldn't do damage to buildings.
Dormant agents would be somewhat cheaper and could not be removed by the targeted race (instead the targeted race could research a slightly extended counter-espionage branch of the technology tree that at each step would double the required number of enemy dormant agents to gather the same amount of intelligence from you.
Dormant agents would have a maintenance cost per week just like ships.
Placement of dormant agents: just enable the player to place agents on empty, unused and unterraformable squares in the pop-up screen where you also place active agents that do damage buildings. Through the same screen you would of course be able remove your own agents if you cant bear their costs.
The shortcomings this approach is of course that a race that is being heavily spied on by other races might not have enough free squares on its planets for your own agents.