I don't think you'll see a dramatic change in the armor and weapon crafting recipes. There's an item for every slot for every level right now. Armor for crafting, gathering and casters is from weaver, helms/belts/feet are from leather worker or weaver, and of course tools and weapons are from the same places as before. There's no holes in the gear, but you will have to dye to get the right stats. Cooking, alchemy and jewelry will get dramatic changes in 1.20, but the rest will likely just have the dated gear removed, and perhaps the class requirements adjusted.