Again, multi-tile trees, nearby hill dwarf settlement, and a personality rewrite sound like pretty big Fort Mode changes.
The big trees should look cool, at least.
Can you "mine" them, and make tree houses? Can you chop them down and cut them up for hundreds of logs? Do they grow an inordinate number of fruits, out on their long high branches?Doesn't look like the hill dwarves affect gameplay in this release. Looking forward to actually interacting with the hill dwarf settlement, for example having them change migration, trade, army arc. So that's really not much of a change for Fort players (EDIT: in this release).
I am looking forward to wrangling the rebrained dwarves. This seems like the biggest change for Fort players (EDIT: in this release).
Fort retirement may be a change to when you can play a fort, and you can muck it up with an adventurer, but it doesn't really necessarily affect a fort's industrial web, how it's laid out, what the dwarves do while you oversee them, etc.