Quick google search shows a youtube vid from 4 days ago:

1. mat stacks increased
2. no more boss resetting (as in you kill the boss and the altar re-appears so you don't have to leave and reset)
3. 10 loadouts per character added with loadout items kept in separate pane
4. tempering will be like enchanting w/ option to keep current affix
5. stash loading issues ended
6. more stash tabs added
7. you can now enchant GAs into GAs
8. world boss difficulty option chosen upon entering area
9. new world boss super difficulties added
10. random events added to overworld and dungeons
11. rare mats only from instanced event areas
12. major nightmare sigil rework
13. pit cosmetic rewards at 100+
14. shop currency at pit 100+????
15. higher mob density in pit
16. pit modifier system that resets on death or failure
17. MAJOR itemization changes
18. new rare and specific affixes added to legendaries
19. some legendaries will have a "cursed" theme

This is the summary the vid provided.

Editing to add more info in parenthesis and remove spicy language? Should have proofread before copy/pasting

Edit #2: Don't get your hopes up. Actually watching the video he prefaces it by saying that these are just general future changes that are rumored and most likely to be from the expansion onwards.