From the releases:
Fresh from the drone factory and straight to the front line, the new Isorian Andhak SC2 Medium Support Drone comes equipped with either the compression cannon or fractal cannon.
Laying down heavy firepower, the new Freeborn heavy mag cannon cleaves through enemy armour and drones.
Isorian Andhak SC2 Medium Support Drone with Compression Cannon and Fractal Cannon Source
Freeborn Heavy Mag Cannon Source