Smarter biter AI with adaptive resistance, breach reinforcement, scheduled raids, wall regen, and overhaul-mod compatibility.
Large total conversion mods.
New ways to deal with enemies, be it attack or defense.
Have Not really seen any biter expansions while playing, playing with only lightly tweaked settings and without mods that should conflict with the behavior.
save file attached if you want to verify im not just nuts https://www.dropbox.com/t/N6UFfALMWwfmuvta