New turrets like the Rocket Swarm Launcher and Foam Turret provide specialized defense against massive raids and fires. The "Full" DLC Suite for v1.4.3901
This specific build was a "maintenance and polish" update that finalized the 1.4 series before the jump to later major versions like 1.5 (Anomaly) and 1.6 (Odyssey).
RimWorld 1.4.3901: The Definitive Guide to the "Full" Experience
The revamped shelving system allows three stacks per tile, effectively tripling storage density and eliminating the "ugly floor" mood debuff.
A comprehensive painting system allows you to dye walls, floors, and furniture using the Titoria crop.