Minecraft wiki entry for Development_versions, associated text: Added data-driven furnace recipes.
Custom furnace recipes can be added to the game using JSON.
Furnace recipes are one per file, like other craft recipes.
Added tags to furnace recipes and made the UI screens use them to filter the recipes down.
Recipes now have tags so they can be filtered by crafting type.
Leash positions now use vanilla positions if not specified in the pack.
Baby zombie pigmen now properly scale their sword in Marketplace content.
Sound-event is now displayed in the scripting documentation.
Renamed blocks in resource packs now keep their custom names.