Well any cannon that has range 3 will have a nerf while cannons at range 1 will get a buff.
It would put range 1 combat more effective for high pilot skills and nerf the range 3 sniper builds.
Missile and torpedoes will not necessarily get a buff as much as they would be slightly better at range 3 than a cannon but will definitely fail at range 1.
These secondary weapons will get a solid nerf
Heavy Laser Cannons
These secondary weapons would get a buff
All turret upgrades
Autoblasters.
These weapons will get a net nerf as in any balance shifts will likely pull power and efficiency from them
Cluster missiles
Proton Rockets
APT