The first death in my first fortress with the new build was nothing impressive, but it suggests industrial accidents are a lot more dangerous that they were before:
I was trying to excavate a ventilation shaft above my butcher's shop so that the body parts wouldn't generate miasma if they rotted.
After digging ramps through several z-levels, I finished with the miner standing on a single tile just above the shop. As there was only a 2 z-level drop from there (down to the butcher's shop, then through the floor to the level below) and as my miner was a "very tough" dwarf who "heals quickly", I decided to risk channeling out the tile she was standing on.
Big mistake.
My miner crashed through the butcher's shop and onto the floor below it, smashing her spine and leaving the biggest pool of blood I've ever seen from such a minor accident, and then suffocated before anyone arrived to rescue her.
He husband (a lye maker who I had conscripted) was already upset about the draft and being hungry, thirsty, and rained on threw a tantrum, smashed one of the beds in the barracks, and then went and killed one of my jewlers (who, ironically, was just in the process of setting down a coffin for the dead miner).
Shortly after the bereaved husband went melancholy.
Not long after, his friend (my other squadie) also went insane, and after they had both died of thirst, their squad leader (my militia commander) also fell melancholy and died.
Easily the most pathetic military I've ever had the misfortune to see in Dwarf Fortress. (Well, maybe the 80-strong reclaim army who lost about 4 dwarfs in retaking a fort, then got wiped out in the ensuing spiral of tantruming, accidental death, and insanity could give them competition.)
Fortunately the jewler had no friends, and the military was its own exclusive clique, so the deaths stopped there.