The Patch 2.3.0 PTR Preview for Diablo III we posted last night outlines some significant changes coming to Blizzard's action/RPG sequel. They outline plans for a new zone, a new artifact, crafting updates, adventure mode updates, a new Season Journey feature, new difficulty levels, new Legendary and Set items, and combat changes. The most drastic change is probably the new artifact, Kanai's Cube, which is apparently the Horadric Cube's daddy. Here's word on this upcoming change that will appear soon on the test realm:

For those who eagerly gather crafting materials on their journey to level 70, we’ve got good news you’ll especially enjoy. Starting in Patch 2.3.0, the same crafting mats you use at max level will be available as you level up! We’ve also crunched down the number of crafting recipes, making the process easier and more fluid than ever as your results now dynamically adjust to your character’s level. Whether you’re bashing skulls on the highest difficulty or have just started your career and killed your first Champion or Elite pack, your crafting mats will never go to waste.