First of all, it adds some fundamental features: support for blending modes when working with layers and brushes, the ability to split up OBJ files by groups, and an auto-save system.
The update also introduces a new plugin system that allows modifying existing nodes and to add entirely new node systems. What is more, the tool now features experimental support for baking texture maps.
The new version includes experimental new live link plugins for Unreal Engine and Unity, so users can edit an asset in ArmorPaint and see changes inside the engines.