I know Frogboy has said in the past he will not include cloaking in GalCiv2. I also know that many players incuding myself would like to see cloaking in the game. So I propose a compromise. When the expansion comes out create an option to enable/disable the cloak/anti-cloak tech trees and components. This way the people who don't want cloaking are happy and so are the people who do want cloaking. Personally I think it would be more challenging to try to track down ships I can't see until they attack. I also think this would encourage people to make sensor ships to counter this threat. Almost like real life intelligence/counter-intelligence.
The Cloak Tech Tree could be something like: Stealth (gives the ship special armor that is resistant to sensors), EM Control (gives the ship a device that eliminates electronic emissions), Reduced Engine Emissions (a device the eliminates engine signatures and noise), Light Bending (a shield that bends light making an object impossible to see), Total Cloak (a shield that combines all the previous techs into a single device), and Phase Cloak ( a cloaking device that puts the ship slightly out of sync with space time making it impossible to detect until it attacks).
Of coarse you would have to have Anti-Cloak/Stealth Tech Tree to all the Cloak Techs. For example Radar (to detect hulls, cannot find Stealth Armored ships), EM Detector (to detect electronic emissions), Emissions Detector (to find engine emissions), Tachyon Detector (to find Cloak Shielded ships), Multi-Phasic Sensors (to detect Phase Cloaked ships).
I hope Frogboy and the devs will consider this option, I think it will add flavour and challenge to the game.