Minecraft wiki entry for Development_versions, associated text: Changed the icon on the trigger button, from a standard book to the Knowledge Book
Added a shift-click ability to the recipe book that puts all available materials in the crafting grid.
Added a new white-and-gray colored notification that pops up when the player unlocks new recipes
The notification only appears upon reloading the world; Dinnerbone has stated that this is a bug[10]
If you search "excited" (changed in 17w18a) in the Recipe book, your language switches to Pirate Speak.