User blog comment:AntiScootaTwo/Exo Zombies Trailer released/@comment-5591504-20141221221630/@comment-24737457-20141222231008

As i see it...the "Pro Perks" could easily be taken from some Extinction armory upgrades

Jugg Default x2 Health, Pro = Tank Upgrade (Invincible to enemies but you attact them...or maybe just the first bit)

Speed Cola Default 1/2 Reload time, Pro = Weapon Specialist upgrade, temporary infinite ammo.

Double Tap Rapid fire + DT2 (Bonus damage)

Revive faster revives, Pro = Pick yourself up once

Well...thats for the original 4...