Sweet JESUS! I assume the Defiant cloak is very straightforward. But how do the armour and sep work?
The armour is kinda stupid. it disables your weapons(I think) and shields, its meant to be used against the Borg when they use their energy draining weapon. I have not used the armour in battle yet, just went by what I read on the forums.
Saucer separation creates a saucer 'pet' that follows you and has 2 phasers, and the star drive section acts like an escort.
Also, the devs are listening to people.
right now Ablative Armour is just a texture, after some 'concerns' from the fans, CaptinLogan (one of the main modellers, he also helped canon-ize the intrepid, galaxy and defiant) decided to model the armour for each intrepid variant. And mind you since the part are mixable, he has to make it so it matches up right. So thumbs up for him
edit:
From the official change log
Ablative Generators:
+900 Damage Resistance Bonus (+90% Damage Resistance)
Energy Weapons Offline
Shields Offline
Lasts up to 30 Seconds or until you turn it off or Auxiliary goes offline
5 minute Recharge Time (reduced from 15 minutes)
(No more Power Drain)
It says energy Weapons, so I'm guessing Torpedoes work (like in the show)
Saucer Separation
Recharge Time 10 minutes (reduced from 15 minutes)
Creates Saucer Pet:
Saucer has 2 Phaser Arrays
Engineering Team and Emergency Power To Shields (Improved Recharge Time on these)
Has 900 of your crew
(Increased Saucer Impulse Speed)
(Increased Saucer Hull and Shield HP)
You command the Stardrive section (Makes you Escort-like):
Buffs your Impulse Speed
Buff your Turn Rate
Changes your power levels to Escort Power Levels
Reduces your Hull HP and Shield HP
Your Crew reduced to 100