Well, this is one hell of a WWAUT...
Berserker: Sure. I really like the Parry buff.
Commando: Is Backup back to level 5 now? I'm guessing the damage increase is for Gorefasts (20->50 head health when resistances were first introduced). Extra ammo is +20% already, but I'm glad to see that you're fixing the skill description. And +100% mag capacity is technically better but it's still up against +25% damage/-50% recoil.
Gunslinger: Zed time reload buff sounds neat. GS is getting knocked down a peg on speed and ReU, but that's fine (the perk is really powerful as is). So the new Quick Draw won't auto-change your weapons instead of reloading? If so, that's quite welcome, because that was the reason many people took Shoot and Scoot instead.
Demolitions: Never really got to play with Reactive Armor, so having it back as a passive is excellent. One suggestion for Mad Bomber: add massive explosive resistance to it lest you have Demos accidentally blowing themselves up during zed time (Destroyer of Worlds doesn't do self-damage, so it would make sense to bump up Mad Bomber as well).
Medic: Symbiotic Health sounds great, but 10% health gained/heal sounds overkill. Maybe x% of health restored (x should be higher than 10)? I'm not so sure on all the team buffs, honestly. I could see it being mitigated by the fact that you pretty much have to focus on one teammate to get the maximum buffs. I'll just have to see how it all plays out though.
Firebug: As mentioned before, Barbecue would probably be better if it sped up the damage ticks or increased DoT damage instead of keeping DoT on longer (same with Napalm). In any case Ground Fire would help with keeping panicked zeds under control.
Support: What...what am I looking at?
How is Support not going to literally murder everything with these buffs? Moving carry weight and Supplier to passive is very nice, as well as being able to fix broken doors. I'm wondering if shotguns are going to get their max ammo nerfed, because current ammo count + 50% passive + 20% with Resupply pack = shotgun rain forever. And the thought of a 3-round DBS is both hilariously ridiculous and insanely awesome.
Sharpshooter: Stability buffs are welcome. The ReU change is a creative way of knocking the Railgun down a peg or two. And Assassin no longer knocks down zeds.
Considering that zeds are getting evading and blocking with this upcoming update (and Crawler gas, and Bloat mines, and...), it's a start. The zeds have quite a ways to go to compete with all of this, but we'll get there.