3 - Burst of Shadows 0/1 (buff to override snare movement penalty, lasts 15 sec) requires 8 pts Covert Operative, 4 pts Smoke Screen
4 - Shadow's Embrace 0/4 (Burst of Shadows duration +2 sec per point, cooldown -30 sec per point) requires 12 pts Covert Operative, 1 pt Burst of Shadows
5 - Covert Mastery 0/4 (reduce action cost of smoke 10% per point) requires 16 pts Covert Operative, 4 pts Shadow's Embrace 5 - Without a Trace 0/1 (makes a spy undetectable by anything other than damage for 30 sec) requires 16 pts Covert Operative, 1 pt Burst of Shadows
4 - Undercover 0/3 (Smoke bomb snare -5% per point, Sneak snare -10% per point) requires 12 pts Covert Operative
It all look's rather sound good that they have some proper stealth attack's i.e bonus dmg from attacking in stealth, bit of an improved heal and extra camo