Weapons not mentioned or discussed:
Heavy weapons - Mortar, Mulcher and Oneshot
Pickup Power weapons - Hammer of Dawn
Lancer-
No headshot multiplier
Retro lancer-
Harder to feather
Requires more 'skill'
Two-piece has been removed, pokes do less damage
Is now following on its intended purpose (close quarter combat), no longer being considered a viable good long range weapon.
Hammerburst-
Fully semi-automatic, modded controllers don't work (currently) on them
Digger-
Moves faster underground
Boomshot-
Less of a "fuzzy boomshot", a better AoE effect.
Scorcher-
Very similar damage output to gears of war 3.
Goes through boomshield
Boltok-
More powerful weapon
Single-headshot(?)
Gorgon-
Similar as before, not much information on it.
Boomshield-
Can be used with any weapon
Markza-
Body shot -> headshot won't kill somebody
Has recoil, low rate of fire
Frags-
Reduced radius and damage, they estimated around 50%.
Stronger than the nerfed special event frag grenades (stay frosty) in gears of war 3
Ink-
No cringe
Smoke-
Only grenade that cringes you
Insta-detonate on impact
Cannot tac-com through the smoke anymore
Incendiary-
have been made a viable power weapon pickup
Longshot-
Glitches are mended
2 layers of zoom
Bullets penetrate multiple enemies
Body shot does more damage
Gnasher-
Ammo issues are apparently mitigated with ammo pickups/ammo boxes
Sawed-off-
Multiple kills possible still
Faster fire rate than the gnasher
Damage/range is the same
Fills a different role now
breechshot-
decent body shot damages
medium ranged
definitely outclasses the markza
booshka-
considered to be on par with the boomshot
3 in the magazine, 2 in the clip
boomshot-
3shots still
melee-
still a 2 hit kill
melee penalty for missing is 'high'
you can still react to melees
failed retro-charge still requires 2 melee hits
beacon-
damage boost is only in overrun
damage boost does not stack if two grenades land beside somebody
classic hammerburst-
3 burst kill