Add compatibility with other mods (ChatBubbles, Tweakeroo, etc).
Customizable armor / held item / cape / elytra / head wearings (skull, pumpkin) / shoulder parrots location, you can hide them in the same way as hiding original models, and add "attached" tag to bones where you want them to be.
Arrows are now able to stuck in custom model parts (Ouch !).
Texture tag is now an expression, use "tex.***" to access your textures (e.g. "texture": "if(is_sneaking,tex.a,tex.b)" with a.png and b.png). Sorry for that old model packs need to be updated to be compatible with the new version.