If you haven't been following along with Season of Discovery (and I don't blame you) then Blizzard said they would make some changes to Shadow Priest with the Launch of P4. Well we have the PTR and the results are underwhelming to say the least...
TLDR: I hope there's more coming.....

Timestamps
0:00 Intro
0:28 What's Wrong with Shadow Priest?
2:42 What did Blizzard Change?
3:39 Making Mind Flay Functional
5:54 Why Changes Aren't Enough
6:47 How Can We Fix Shadow Priest?