Post was updated with several minor bits of information from the latest dev stream.
We also got some great spoilers for 0.8.4. Here is an upcoming Primalist skill, called Upheaval:
The tech used to create Upheaval’s visuals looks like it’s also being used in the recently shown off Entangling Roots rework:
And there’s more leaks 
– in the Legendary Items & Crafting Updates threads.