Because no one posted the exact quote:
The carts seem to be grabbing and giving up bins and barrels properly now, so that's good. Watching them work has us leaning toward giving the hauler the option to hitch a ride on the cart instead of just kicking it along, so it looks like we may very well be having cart-riding dwarves screaming down ramps and spinning off into space this release after all, at least in this context.
My biggest thought here? Dedicated hauler class. Your metalsmiths don't even have to handle the ore, the haulers will unload it from the carts!
Also military deployment:
Have a series of 10 small rooms. Each room has a bridge on the outside and a door on the inside. When "locked" the door is closed and the door is open, and when "open" the door is open and the bridge is closed, so it functions as an airlock.
A pressure plate is inside the room, or else a lever operated somewhere, which links to both the door and the bridge.
Each room has a burrow in it.
Behind the door is a minecart and a single sock, with the conditions "launch when partially full."
Siege arrives.
Order military to defend burrows, and they run to their rooms.
Lever/plate to cycle the airlock.
Remove their military orders, making them into civilians, causing them to haul the sock into the cart, jump on, and ride.
Cart goes directly to the siege.
*claps hands* We have dwarven shock troopers.