Here is a list of all known changes for the 2013 patch, enjoy!

Infiltrator:

Scatter Blaster: 

Damage 18 > 15

Mods:

• Sonic Blast returned over Force Feedback.

• Fireblast DPS 30s > 20s, Duration 3s > 2s

Subsonic Repeater: 

Damage 21 > 14

Mods:

• Turbo Booster removed for Cyber Optics

Nucleon Charge Rifle: 

Charge rate 1s > 2.5s

Mods:

•  Dominator removed for Deadeye

Path Blaster:

Damage 110 > 110

Mods:

• Accuracy decreased, spread cooldown increased

•  Sonic Blast returned

Cloaking:

RefillRate 0.833 > 1

Duration 10s > 8s

Sprint/BoostDrainRate 1 > 2

Mods:

• Shadow Stalker 3s > 2s

• Dimensional Step removed for Specter.

• Cloak Intercooler 2.0 > 1.5

EMP Grenade:

Flashbang duration 5s > 3.5s |

RefillRate 0.5 > 1

Charges 2 > 1

Mods:

• Speed Redirector 1.6 > 1.5

• EMP Intercooler 1.3 > 2.0

Destroyer:

Riot Cannon:

Damage: 135 > 175

Mods:

• Planet Buster: 185 > 200
• Sonic Blast 0.54 > 0.65
• Ion Cartridge 2 > 3

A4 Pulsar Cannon:

Blast radius increased by 10%

• Base projectile speed increased by 15%

Mods:

• Cyberthermic Frag 1.3 > 1.15
• Ion Cartridge 3 > 4

Chaos Rift Combustor:

Damage 150 > 250

Mods:

• Chaos Fuse bonus 4 > 2

Thermo Rocket Launcher

• No changes

Barrier:

RefillDrainRate and RefillRate 5 > 2

FadeoutTime 3 >1

Mods:

• Fortify: 0.57 > 0.5
• One-Way Barrier returned over Ammo Amplifier

Hover:

Damage 250 > 150

RefillRate 1 > 0.75

Radius 750 > 500

Mods:

• Divebomb 1.5 > 1.25
• Aerial Camper now recharges Hover while standing still.

Titan:

Scrapmaker:

Accuracy reduced by 15%

Mods:

• Cyber Optics returned over Energon Rush
• Ion Cartridge 50 > 100

Energon Harvester:

Damage: 20 > 15

Mods:

• Reaper 1.3 > 1.5
• R-Infinity Finder returned over Cyber Optics

Corrosive Slime Cannon:

No changes.

E.D.K TechVolt:

Damage: 105 > 135

Mods:

• Zero-G Casing: 2.0 > 1.5
• Energo-Cell Conductor 1.25 > 1.15

Whirlwind:

RefillRate 2 > 1

Initial Resource Drain Rate 0 > 10

DrainRate 5 > 2

ResourceRequired and ResourceMax 30 > 20

Mods:

• Flurry of Blows 1.25 > 1.15
• Energon Absorbers 0.0786 > 0.85
• P.O.K.E Alpha 1.40 > 1.25

Flak Shield:

DrainRate 1 > 0.8

RefillRate 1.5 > 1.2

Health 900 > 600

Mods:

• Brute Force 0.6 > 0.5

Scientist:

Neutron Assault Rifle:

• Damage 28 > 29

Mods:

No changes.

Photon Burst Rifle:

• Damage: 156 > 136

Mods:

• Photon Accelerator 1.03 > 1.05

Gear Shredder:

Homing strength increased.

Mods:

• Tachyon Transmitter 2.0 > 1.5
• Torque Ripper 0.4 > 0.5

Orbital Pistol:

Damage: 50 > 75

Accuracy decreased.

Spread cooldown decreased.

• Armor debuffs 1.1 > 1.2 > 1.3.

Mods:

• Energon Stinger strength is now 1.15 > 1.25 > 1.35 per mark level.
• Orbital Trace Hack 1.4 > 1.5

Heal Beam:

• RefillRate 2 > 0.75
• ResourceMax 10 > 8
• Line of Sight delay 1.25 > 2.5
• Healing per second 70 > 75

Mods:

• Empowered Beam 0.625 > 0.6
• Energon Recharge healing 150 > 100
• Battle Medic 1.3 > 1.1

Battle Sentry:

Damage 14 > 16

RefillRate 0.9 > 1.5

ResourceDrainRate 0.75 > 0.5

ResourceRequired and ResourceMax 18 > 30

InitialResouceDrainRate 0 > 5

Mods:

• Sentry Power Core 1.625 > 1.4
• Resource Recycler returned over Sentry Armor

Pickups:

• Energon Recharger 8s > 7s