New +3 Knowledge Treasures for Crafting professions are all located in Zaralek Cavern. Like all Knowledge Treasures, you must have at skill of at least 25 in the profession to interact with them.
Credit and sincere thanks to Blazeton from /r/woweconomy subreddit for their locations! These are all now included in the Knowledge Point guide: Earning Knowledge Points All Crafting professions except Engineering have three new items for a total of +9 Knowledge points. However, Engineering have eight new items for a total of +24.
This is likely to make up for the fact that there were so few Engineering Knowledge Treasures in the beginning Dragon Isles zones.
ProfessionItemLocationAlchemyMarrow-Ripened Slime/way #2133 62.10 41.12AlchemyNutrient Diluted Protofluid from Malnourished Specimen/way #2133 52.68 18.30AlchemySuspicious Mold/way #2133 40.48 59.18BlacksmithingBrimstone Rescue Ring/way #2133 48.30 21.95BlacksmithingWell-Worn Kiln/way #2133 57.15 54.64BlacksmithingZaqali Elder Spear/way #2133 27.53 42.87EnchantingLava-Drenched Shadow Crystal/way #2133 48.00 17.00EnchantingResonating Arcane Crystal/way #2133 36.66 69.33EnchantingShimmering Aqueous Orb/way #2133 62.39 53.80EngineeringBusted Wyrmhole Generator/way #2133 37.82 58.83EngineeringDefective Survival Pack/way #2133 50.51 47.93EngineeringDiscarded Dracothyst Drill/way #2133 49.44 79.01EngineeringHandful of Khaz'gorite Bolts from Bolts and Brass/way #2133 57.65 73.94 EngineeringHaphazardly Discarded Bomb/way #2133 48.17 27.93EngineeringInconspicuous Data Miner/way #2133 49.87 59.25EngineeringMisplaced Aberrus Outflow Blueprints/way #2133 48.48 48.64EngineeringOverclocked Determination Core from Molten Scoutbot/way #2133 48.10 16.59InscriptionHissing Rune Draft/way. Read more on wowhead.com